The energy absorbed by the water is qH₂0 is 1690.8 J.
What is energy?Energy is the capacity to do work or produce heat. It can be found in many different forms, such as chemical, kinetic, gravitational, electrical, nuclear, and thermal energy. Chemical energy is stored in the bonds of atoms and molecules, which can be released through chemical reactions. Kinetic energy is the energy of motion, and is generated by moving objects.
The energy absorbed by the water can be calculated using the equation q = m * c * ∆T, where m is the mass of the water, c is the specific heat capacity of water, and ∆T is the change in temperature.
m = 100.0 mL * (1.00 g/mL) = 100.0 g
c = 4.18 j/g•C
∆T = 27.8 °C - 23.7 °C = 4.1 °C
Therefore, the energy absorbed by the water is qH₂0 = 100.0 g * 4.18 j/g•C * 4.1 °C = 1690.8 J.
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A student throws a 0.170 kg ball straight upwards to a height of 4.00 m how much work did the student do
The work done here on throwing the ball straight upwards to a height of 4 m is the change in its potential energy. Hence, here the change in potential energy is 6.66 J.
What is work done ?Work done is a physical quantity that measures the how much the force is effective in making a displacement. Hence it is the product of force and displacement.
The work done in bringing an object from one place to the other is called its potential energy. Here, the work done on throwing the ball straight upwards tp a height of 4 m is equal to its potential energy at this height.
Potential energy = mgh
g = 9.8 m/s²
m = 0.170 kg
h = 4 m
p = 9.8 m/s² × 4 m × 0.170 kg = 6.66 J.
Therefore, the work done in throwing the ball is 6.66 J.
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Iron ore, which is composed of mostly Fe2O3, is converted to cast iron (Fe) in a blast furnace.
The reaction is given below:
Fe2O3 + 3CO
⟶
2Fe + 3CO2
If 159.2 kg of Fe is obtained from 267.5 kg of ore and the percent yield of the reaction is 95.0% , what is the percent of Fe2O3 in the iron ore? Assume that there is enough CO to react with all the Fe2O3.
Molar mass of Fe2O3 = 159.69 g/mol
Molar mass of Fe = 55.85 g/mol
What is essential in an oxidation-reduction reaction?
Answer:
Explanation:
In an oxidation-reduction (redox) reaction, electrons are transferred from one substance to another. There are two key components that are essential in a redox reaction:
An oxidizing agent (or oxidant): This is the substance that accepts electrons and becomes reduced during the reaction. The oxidizing agent is responsible for causing oxidation in the other substance involved in the reaction.
A reducing agent (or reductant): This is the substance that donates electrons and becomes oxidized during the reaction. The reducing agent is responsible for causing reduction in the other substance involved in the reaction.
In a redox reaction, the reducing agent is oxidized and loses electrons, while the oxidizing agent is reduced and gains electrons. The transfer of electrons from one substance to another is what drives the reaction and leads to the formation of new products.
For example, consider the reaction between magnesium metal (Mg) and oxygen gas (O2) to form magnesium oxide (MgO):
2Mg + O2 → 2MgO
In this reaction, magnesium metal is oxidized (loses electrons) and oxygen gas is reduced (gains electrons). Magnesium is the reducing agent, while oxygen is the oxidizing agent.
When a solution forms from some compound, the temperature of the solution quickly drops. Which of the following statements is true? Select all that apply: a. The dissolution process is endothermic. b.The dissolution process is exothermic. c.The entropy of solution is likely highly positive. d.The entropy of solution is likely highly negative.
a. The dissolution process is endothermic.The entropy of solution is likely highly positive.the temperature of the solution quickly drops.
What is endothermic ?Endothermic is a type of chemical process in which energy is absorbed from the surroundings in order to cause a reaction. A common example of an endothermic reaction is the dissolution of anhydrous ammonia in water. When this happens, the reaction absorbs energy from the surrounding environment in the form of heat. This is because the ammonia molecules need to break apart in order to dissolve in the water. It is also possible for reactions to be endothermic without the need to absorb heat; in this case, the reaction absorbs energy from the environment in the form of light or electricity. Endothermic reactions can be used to create energy efficient products such as insulation, air conditioners, and refrigerators. In addition, endothermic reactions are used in many industrial processes.
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4Fe(s)+3O2(g)⇄2Fe2O3(s)ΔH=−1,650kJ/molrxn The oxidation of Fe(s) is represented by the chemical equation above. Which of the following correctly explains whether or not the reaction is thermodynamically favorable?
There are more particles (including particles in the gas state) in the reactants than in the product, thus ΔSrxn<0. Because ΔH is large and negative, the reaction will be thermodynamically favorable at low temperatures explain whether or not reaction is thermodynamically favorable. THe correct answer is A.
The reactants include more particles (including particles in the gaseous state) than the product, therefore ΔSrxn<0. The reaction will be thermodynamically advantageous at low temperatures since H is big and negative.
ΔS<0. Because ΔG=ΔH−TΔS<0 is the need for a process to be thermodynamically advantageous, ΔG must be negative for -TS to be substantially lower than ΔH in size. At low temperatures, this will be accurate.
Your question is incomplete but most probably your full question was
4Fe(s) + 3O2(g) ⇋ 2Fe2 O3(s) ΔH = −1,650 kJ/molrxn
The oxidation of Fe(s) is represented by the chemical equation above. Which of the following correctly explains whether or not the reaction is thermodynamically favorable?
A There are more particles (including particles in the gas state) in the reactants than in the product, thus ΔSrxn < 0 . Because ΔH is large and negative, the reaction will be thermodynamically favorable at low temperatures.
B There are more particles (including particles in the gas state) in the reactants than in the product, thus ΔSrxn < 0. Because ΔH is large and negative, the reaction will not be thermodynamically favorable at any temperature.
C There are more particles (including particles in the gas state) in the reactants than in the product, thus ΔSrxn > 0. Because ΔH is large and negative, the reaction will be thermodynamically favorable at all temperatures.
D There are more particles (including particles in the gas state) in the reactants than in the product, thus ΔSrxn > 0. Because ΔH is large and negative, the reaction will not be thermodynamically favorable at any temperature
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Duringthe molten of mgcl2 write the reaction if anod
and cathode
The anode and the cathode reaction is given as : Anode:
2Cl- (aq) → Cl2 (g) + 2e- (oxidation)
Cathode:
Mg2+ (aq) + 2e- → Mg (s) (reduction)
How to write the chemical reactionThe reaction at the anode and cathode during the electrolysis of magnesium chloride (MgCl2) can be written as follows:
Anode:
2Cl- (aq) → Cl2 (g) + 2e- (oxidation)
Cathode:
Mg2+ (aq) + 2e- → Mg (s) (reduction)
These reactions occur as a result of the movement of ions in the solution towards the electrodes, where they gain or lose electrons, producing the desired products.
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How many mililiters of water should a chemist add if they want to prepare an 0.200 M aqueous solution with 30.2 g of NaCl ? Assume the density of the resulting solution is the same as the water. STARTING AMOUNT ADD FACTOR ANSWER 0.001 0.5171.51 10" 6.022 * 10% 58.44 22.99 2580 1000 30.2 2.58 mol Naci MNaci Nacimol mL 0.200 151 1 g Naci
The volume of the solution is 2600 L
How do you prepare a solution?The first step is to determine how much solute you need to dissolve in the solvent. This will depend on the desired concentration of the solution and the volume of solvent you plan to use then measure the amount of solute needed for the solution. Be sure to use the correct units of measurement.
We know that;
Number of moles of the NaCl = 30.2 g/58.5 g/mol
= 0.52 moles
Now;
Number of Moles = Concentration * volume
Volume = Number of moles/Concentration
= 0.52 moles/0.200 M
= 2.6 L or 2600 mL
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Which of the gases in air are elements explain how you can tell
Answer: Nitrogen, Oxygen, Argon, Helium and Neon are elements.
Explanation:
The main components of air are:
Nitrogen (78%)
Oxygen (21%)
Carbon dioxide (0. 04%)
Argon (0. 93%)
Trace amounts of helium, neon, methane, hydrogen and water vapour.
Out of all these components here, Nitrogen, Oxygen, Argon, Helium and Neon are elements. We can tell that because element is a chemical substance that cannot be broken down into other substances, and here we can see that unlike methane(CH₄), Carbor dioxide (CO₂) or water vapor(H₂O) , these elements cannot be broken down into anything simpler.
hope that helps...
Please show your work
Suppose 13.7 g of C2H2 reacts with 18.5 g O2 according to the reaction below. What is the mass of CO2 produced? What is the limiting reagent?
2C2H2(g) + 5O2(g) → 4CO2(g) + 2H2O(l)
O2 is the limiting reagent and yields 20.4g of CO2.
Describe limiting reagent
The limiting reactant, also known as the limiting reagent, is the reactant that is used first during a chemical reaction, hence restricting the amount of product that can be produced.
2C₂H₂ + 5O₂ → 4CO₂ + 2H₂O
Quantity of C2H2 moles:
Moles equal mass divided by molar mass.
13.7 g/26.04 g/mol is the number of moles.
= 0.526 mol.
O2 moles are calculated using the formula: moles = mass / molar mass.
18.5 g/32 g/mol = the number of moles
= 0.578 mol
Produced CO2 mass:
Number of moles times molar mass equals mass.
Mass = 0.4622 mol at 44 g/mol
Mass = 20.328 g
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Which of the following can form hydrogen-bonds?A. Acetic acidB. EthaneC. Formyl chloride, CHClO
The following molecule that can form hydrogen bonds is acetic acid (A)
Because it is a polar molecule, acetic acid is capable of forming hydrogen bonds with the water molecules in the environment. The hydrogen bonding (H-bonding) that exists between the molecules of acetic acid and water is the most powerful force that is responsible for determining the chemical and physical characteristics of the mixture. In its structure, acetic acid exhibits both a double oxygen-carbon bond as well as a hydrogen atom that is connected to an oxygen atom.
The oxygen atom that is part of the double bond in the acetic acid molecule has the potential to form a hydrogen bond with one of the hydrogen atoms in the water molecule. Two equivalent hydrogen bonds are known to cause acetic acid to form a cyclic dimer. Because of how stable the dimer is, it can even stay in the gas phase.
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A temperature change of +3°C is measured when a sample of calcium metal is burned in oxygen in a constant volume bomb calorimeter. Which statement correctly describes the changes in the stated thermodynamic functions for this reaction? A + + uB 0 00C - - -D - ++E + 0 +
The correct option is the option (b) .
What is temperature ?
Temperature is a unit used to represent how hot or cold something is. It can be stated using the Celsius or Fahrenheit scales, among others. Temperature shows which way heat energy will naturally flow, i.e., from a hotter (body with a higher temperature) to a colder (body with a lower temperature) (one at a lower temperature).
What is pressure ?
The definition of pressure is the amount of force that is exerted to a certain region. It can be calculated mathematically as P=FA, where F is the force applied perpendicular to surface area A. The pascal (Pa), or one newton per square metre (N/m 2), is the accepted unit of pressure..
In a constant volume bomb calorimeter change in temperature is ∆T= 30C and as the volume is constant so change in volume ∆V= 0.
So we have work done= P×∆V= P×0= 0
Where P is the pressure.
Again burning calcium metal with oxygen is an exothermic reaction and heat is released.
So "q= -". And we have according to first law of thermodynamics ," energy can neither be created nor be destroyed" So q= ∆E+ W and W=0
So "q=∆E= -".
Hence, q= - , W=0, ∆E= -
So correct option is option-B
Therefore, The correct option is the option (b) .
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You just purchased a 2.0 lb. bag of urea, which is used as a cost-effective fertilizer for your garden. Urea has the chemical formula, (NH2)CO, and a molar mass of 60.06. g/mol. How many nitrogen atoms are present in this 2.0 lb. bag of urea? (1 pound = 453.6 g).
Urea is the primary nitrogenous byproduct of protein breakdown in all mammals as well as certain fishes. Therefore, 1.81×10²¹atoms are present.
What is urea?Urea, commonly known as carbamide, is a carbonic acid diamide. It has the formula H2NCONH2. Urea is used as a fertilizer as well as feed additive, as well as a beginning ingredient in the production of polymers and pharmaceuticals. It is a colorless, crystalline chemical that dissolves at 132.7 degrees Celsius (271 degrees Fahrenheit) and decomposes after boiling.
Urea is the primary nitrogenous byproduct of protein breakdown in all mammals as well as certain fishes. The substance is found not just in all animals' urine, but also mammalian blood, bile, milk, as well as sweat.
mole =given mass /molar mass
=2×453.6g/60.06
=907.2/60.06
= 15.10
atoms of nitrogen = 2×15.10 × 6.022×10²³=1.81×10²¹atoms
Therefore, 1.81×10²¹atoms are present.
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Superficial fascia refers to the fatty hypodermis below the skin, whereas deep fascia are the sheets of tissue that wrap around muscles, large blood vessels, etc. a. true b. false
The given statement is true. Superficial fascia refers to the fatty hypodermis below the skin.
The lamina propria of mucous membranes is created by areolar connective tissue. In contrast to the deep fascia, which are the sheets of tissue that wrap around muscles, big blood arteries, etc., the superficial fascia is the fatty hypodermis beneath the skin. The hypodermis contains a sizable portion of the body's fat tissue.
Directly beneath the epidermis and the topmost adipose layers is the superficial fascia. It can exhibit stratification both macroscopically and grossly. It is typically defined as consisting of loosely packed interwoven collagen and elastic fibers in membranous layers.
Bones, muscles, nerves, and blood arteries are encircled by deep fascia. Compared to the other kinds, it frequently has a more fibrous nature and is rich in hyaluronan.
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Hydrogen peroxide with manganese (iv) oxide
Molecular equation, total ionic equation, and net ionic equation
The balanced equation is; 2MnO2 + 3H2O2 + 2OH − →2MnO4− +4H2O
What is the balanced chemical equation?A balanced chemical equation is a chemical equation in which the number of atoms of each element is equal on both sides of the equation. This means that the same number of atoms of each element are involved in the reactants (the starting materials) and the products (the substances formed).
Balancing a chemical equation ensures that the law of conservation of mass is obeyed, as the total mass of the reactants must equal the total mass of the products.
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compare and contrast the cause of a flow of water in a pipe and the cause of a flow of electrons in a wire
The flow of water in a pipe and the flow of electrons in a wire are both examples of fluid flow and are caused by different physical phenomena.
The flow of water in a pipe is caused by a pressure difference, also known as a pressure gradient, between two points. If the pressure at one end of the pipe is higher than the pressure at the other end, water will flow from the high-pressure end to the low-pressure end. The flow rate will depend on the pressure difference, the diameter of the pipe, and the viscosity of the fluid.
The flow of electrons in a wire, on the other hand, is caused by a difference in electrical potential, also known as a voltage difference, between two points. If the voltage at one end of the wire is higher than the voltage at the other end, electrons will flow from the high-voltage end to the low-voltage end. The flow rate will depend on the voltage difference, the resistance of the wire, and the number of electrons available to flow.
In summary, the cause of the flow of water in a pipe is a pressure difference, while the cause of the flow of electrons in a wire is a voltage difference.
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Match each type of substance with the correct description of its behavior according to the Arrhenius acid-base definition.-An acid contains one or more: hydrogen atoms in its formula.-A base contains the unit: OH in its formula.-H3O+ ions are produced: an acid in an aqueous solution.-OH- ions are produced: by a base in an aqueous solution.
Compatibility of types of substances based on the description according to the Arrhenius acid-base definition is -A base contains the unit: OH in its formula.
What is acid-base?Acid is a substance that when dissolved in water will decompose and produce H+ ions. Examples of acids such as hydrogen chloride (HCl), when dissolved in water will decompose into H+ ions and Cl- ions.
While a base is a substance that when dissolved in water produces OH- ions. An example is the compound sodium hydroxide NaOH which when dissolved will decompose Na+ and OH-. The reaction of a base with an acid will produce a 'salt' compound.
According to the Arrhenius definition, acids and bases are acids as substances that when dissolved in water produce hydronium ions (H+). Meanwhile, a base according to Arrhenius is a substance that can produce hydroxide ions when dissolved in water, or in its formula it is called (OH−).
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to determine the freezing point depression of a licl solution, toni dissolved 0.411 g of licl in 19.7 ml of distilled water. determine the molal concentration (m) of the resulting solution. mwlicl
The molal concentration of the resulting solution is 0.492 m. The concentration number of moles of solute in one kg of solvent.
It is the measure of the concentration number of moles of solute in one kg of solvent.
To calculate the molal concentration first calculated the mass of,
mass = density × volume
Put the values,
m = 1 g/mL 19.7 mL
m = 19.7 g or
m = 0.0197 kg
Calculate the moles of LiCl:
[tex]n = \frac{0.411 m }{42.395 g} * 1 mol[/tex]
n = 9.69 × [tex]10^{-3}[/tex] moles
So, now the molal concentration,
[tex]m = \frac{9.69 * 10^{-3} mol }{0.0197}[/tex]
m = 0.492
Therefore, the molal concentration of the resulting solution is 0.492 m.
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oxygen (o) reacts with lithium (li) to form li2o. when selenium (se) reacts with sodium (na), which of the following products forms?
Depending on the reaction conditions, the reaction between selenium (Se) and sodium (Na) can result in a variety of compounds. However, sodium selenide is a frequently formed product (Na2Se).
Under the right circumstances, sodium (Na) and selenium (Se) can react to generate a variety of products, including sodium selenide (Na2Se) and/or other intermediary compounds. The creation of ionic compounds with various stoichiometries is often the outcome of an electron transfer process between the reactants. Temperature, pressure, concentration, and the presence of catalysts are a few examples of the variables that may have an impact on the reaction rate and product distribution. With a high melting point and black hue, sodium selenide is a solid that is frequently utilised in the production of other selenium compounds. Overall, the reaction of selenium with sodium is a significant procedure for producing compounds containing selenium that have a variety of uses in chemistry, materials science, and industry.
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Calculate the moles of Cl atoms in 0.0395 g of C₂H4Cl₂.
The moles of Cl atoms in 0.0395 g of C₂H₄Cl₂ is 1.28 x10⁻⁴ There are two chlorine atoms in a mole of chlorine. since chlorine has two atoms.
Evaluating :1 mole of C₂H₄Cl₂ has 2 Cl atoms per 99g, or x moles,
n = (0.0649/99).
You would get the number of Cl atoms in 0.0649 g of C₂H₄Cl₂ by multiplying by 2x.
First, find the molecular weight of C₂H₄Cl₂. Look up in your chemistry book the atomic weights in g/mole of C, H, and Cl. The molecular weight is
2(C) + 4(H) + 2(Cl).
Dividing the given mass of C₂H₄Cl₂ by the molecular weight. Which gives the number of moles of C₂H₄Cl₂.
Finally, we have to multiply the number of moles of C₂H₄Cl₂ by 2 to get required number of moles of Cl atoms.
What is meant by moles of atoms?
The mole is the amount of a system's substance that is equal to the number of elementary entities in 0.012 kilograms of carbon 12; Mol is its symbol. A mole is the amount of a substance that has the same number of discrete entities (like atoms, molecules, and ions) as a sample of pure 12C that weighs exactly 12 g.
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What mass of MnO2 is produced when 445 grams of H2O are reacted?
H2O + 2MnO4− + Br− → BrO3− + 2MnO2 + 2OH−
5,200 g
4,300 g
0.430 g
8,600 g
Question 2(Multiple Choice Worth 4 points)
(05.05 MC)
What mass of H2 is needed to react with 8.75 g of O2 according to the following equation: O2(g) + 4H2(g) → 2H2O(g)?
0.547 g H2
2.21 g H2
4.38 g H2
17.5 g H2
The term mole concept is used here to determine the mass of hydrogen. The mass of MnO₂ which is 4300g and that of hydrogen is 2.21 g. Thus the correct option is B for question 1 and same B for question 2 .
What is a mole?One mole of a substance is defined as that quantity of it which contains as many entities as there are atoms exactly in 12 g of carbon - 12. The formula used to calculate the number of moles is:
Number of moles = Given mass / Molar mass
The molar mass of water is 18.01528 g/mol and the given mass is 445 g.
Then the number of moles is:
445 g/ 18.01528 g/mol = 24.7 mol
In the equation 1 mole of 'H₂O' = 2 mole of 'MnO₂' and the molar mass of MnO₂ is 86.93 g/mol.
Then the mass of MnO₂ produced is:
445 ×1/18.01528 ×2 mol MnO₂/ 1 mol H₂O × 86.93 g/mol / 1 mol H₂O
= 4294.3 g
In scientific notation it is written as 4.3 × 10³ g = 4,300 g.
Thus the correct option is B.
In question 2:
The molar mass of oxygen is 16.00 g/mol and the given mass is 8.75.
Then the number of moles is:
8.75 g / 16.00 g/ mol = 0.546 mol
In the equation 1 mole of 'O' = 4 mole of 'H' and the molar mass of H₂ is 1.00794 g/mol.
Then the mass of H₂ produced is:
8.75 × 1 / 16.00 × 4/1 × 1.00794 / 1 = 2.2048 = 2.21 g.
Thus the correct option is B.
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Using the solubility curve above, determine whether each amount of Ce2(SO4)3 dissolved in 100 grams of water at 10 oC would be unsaturated, saturated, or supersaturated. You will be using each of the labels only once.
saturated
a. 25 grams b. 10 grams c. 5 grams
unsaturated
a. 25 grams b. 10 grams c. 5 grams
supersaturated
The molality of calcium chloride (CaCl2) in an aqueous solution is 4 m. What is mole fraction of the solute? Keep 3 significant figures in your answer.
Calculate the molality of an ethylene glycol (C2H6O2) soltuion, that has a molarity of 2.87 M. The density of the solution is 1.04 g/mL. Only enter the numerical value with 3 significant figures in the answer box below. Do NOT type in the unit (m).
To construct the solubility curve, we must first determine the maximum amount of Ce2(SO4)3 that can dissolve in 100 grams of water at 10°C, which is approximately 20 grams.
How to find the mole fraction?To find the mole fraction of the solute in a solution of 4 m CaCl2, we need to first calculate the moles of CaCl2 present in 1 kg (1000 g) of the solution:
moles of CaCl2 = molality x mass of solvent (in kg)
= 4 mol/kg x 1 kg
= 4 mol
Next, we need to find the total moles of solute and solvent in the solution:
moles of solute = 4 mol
moles of solvent = mass of solvent (in g) / molar mass of solvent
= 1000 g / 18.015 g/mol (molar mass of water)
= 55.49 mol
Therefore, the total moles of solute and solvent in the solution is:
total moles = moles of solute + moles of solvent
= 4 mol + 55.49 mol
= 59.49 mol
Finally, we can calculate the mole fraction of the solute:
mole fraction of solute = moles of solute / total moles
= 4 mol / 59.49 mol
= 0.0672
Therefore, the mole fraction of the solute in a 4 m CaCl2 solution is 0.0672.
To calculate the molality of an ethylene glycol solution with a molarity of 2.87 M, we need to use the formula:
molality = moles of solute/mass of solvent (in kg)
We can find the moles of solute by multiplying the molarity by the volume of the solution in liters:
moles of solute = molarity x volume (in L)
= 2.87 mol/L x 1 L
= 2.87 mol
We can find the mass of the solvent by using the density of the solution:
mass of solvent = volume of solution x density
= 1 L x 1.04 g/mL
= 1040 g
Converting the mass of the solution
a. 25 grams: This is a supersaturated solution because 25 g is more than the maximum amount of Ce2(SO4)3 that can dissolve in 100 grams of water at 10°C.
b. 10 g: Because 10 g is less than the maximum amount of Ce2(SO4)3 that can dissolve in 100 g of water at 10°C, this solution is saturated.
c. 5 g Because 5g is less than 10g, this is an unsaturated solution.
As a result, the answers are: a. supersaturated, b. saturated, and c. unsaturated.
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What is a possible use for a genetic fingerprint?
1. To identify is someone was present at a crime scene.
II. To identify if two people are related.
III. To identify if someone is guilty of a crime.
A. I and II
B. I, II, and III
C. II and III
Write the empirical formula of at least four binary ionic compounds that could be formed from the following ions:
Zn2+, Au3+, Cl−, S2−
Answer:
Explanation:
To determine the empirical formula of binary ionic compounds, we need to balance the charges of the cations and anions.
Zn2+ and Cl-: Since Zn2+ has a charge of 2+ and Cl- has a charge of 1-, we need two Cl- ions to balance the charge. Therefore, the empirical formula is ZnCl2.
Zn2+ and S2-: Since Zn2+ has a charge of 2+ and S2- has a charge of 2-, we only need one of each ion to balance the charge. Therefore, the empirical formula is ZnS.
Au3+ and Cl-: Since Au3+ has a charge of 3+ and Cl- has a charge of 1-, we need three Cl- ions to balance the charge. Therefore, the empirical formula is AuCl3.
Au3+ and S2-: Since Au3+ has a charge of 3+ and S2- has a charge of 2-, we need two S2- ions to balance the charge. Therefore, the empirical formula is Au2S3.
The empirical formulas of the binary ionic compounds formed from Zn2+, Au3+, Cl-, and S2- are ZnCl2, ZnS, AuCl3, and Au2S3.
covalent bonds form when:
a) two molecules of water share electrons
b) a molecule of water becomes an ion
c) two hydrogen atoms share electrons with one oxygen atom
d) two hydronium ions are attracted to each other
Answer: C
Explanation:
Covalent bonds are formed when atoms share electrons.
Two hydrogen atoms sharing electrons with one oxygen atom are covalent bonds.
what is the actual average mass of 1 li atom (in grams/atom)? express your answer in scientific notation to 3 sig. fig.
The actual average mass of 1 lithium atom is 6.941 grams/atom this is equal to one mole of lithium.
What is atomic mass ?The fundamental physical property of matter is mass. The atomic mass refers to the mass of an atom or molecule. To calculate the average mass of elements and molecules and to solve stoichiometry problems, the atomic mass is used.
Lithium, for example, has an atomic mass of 6.941 grams, which is equivalent to one mole of lithium. This is why we express atomic and molecular masses in grams per mole, or g/mol.
Thus, The actual average mass of 1 lithium atom is 6.941 grams/atom.
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2) A 7.90 L container holds a mixture of two gases at 51 °C. The partial pressures of gas A and gas B, respectively, are 0.292 atm and 0.676 atm. If 0.110 mol of a third gas is added with no change in volume or temperature, what will the total pressure become?
A 7.90 L container holds a mixture of two gases at 51 °C. The partial pressures of gas A and gas B, respectively, are 0.292 atm and 0.676 atm. If 0.110 mol of a third gas is added with no change in volume or temperature, the total pressure become 1.25atm.
What is an ideal gas law ?The Ideal Gas Law states that under the same temperature, pressure and volume all gases contain the same number of molecules.The Ideal Gas law not apply when the temperature and pressure are near the point of transubstantiate into a liquid or solid.
Partial pressure of A gas = 0.292atm
Partial pressure of B gas = 0.676atm
Total pressure=(0.292+0.676)atm
= 0.968atm
Volume = 7.90L
Temperature = 324K
Calculate the number of moles as follows:
PV = nRT
0.968 × 7.90 = n 0.0821L × 324
n = 0.968 × 7.90/ 0.0821L × 324
= 7.64 / 26.6
=0.28 mol
Moles of A and B = 0.28mol
Moles of third gas = 0.110mol
Total moles=(0.28+0.110)mol
=0.39mol
Calculate the total pressure as follows:
P(7.90L)=(0.39mol)(0.0821L.atm/mol.K)(324K)
P=(7.90L)
(0.39mol)(0.0821L.atm/mol.K)(310K)
= 1.25atm
Thus, the total pressure become 1.25atm.
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In radioactivity, half-life refers to the interval of time required for one-half of the atomic nuclei of a radioactive sample to decay. If the half-life is 1 000 years, which of the following alternatives is the best approximation of the time, when 7/8 of nuclei have decayed and 1/8 are remaining?In radioactivity, half-life refers to the interval of time required for one-half of the atomic nuclei of a
radioactive sample to decay. If the half-life is 1 000 years, which of the following alternatives is the
best approximation of the time, when 7/8 of nuclei have decayed and 1/8 are remaining?
In radioactivity, half-life refers to the interval of time required for one-half of the atomic nuclei of a
radioactive sample to decay. If the half-life is 1 000 years, which of the following alternatives is the
best approximation of the time, when 7/8 of nuclei have decayed and 1/8 are remaining?
The best option would be that If the half-life is 1 000 years, then the time when 7/8 of nuclei have decayed and 1/8 are remaining is approximately 2,000 years.
What is radioactivity?Radioactivity is the phenomenon in which an atomic nucleus undergoes spontaneous decay, emitting particles and radiation in the process. This results in the emission of alpha particles (helium nuclei), beta particles (electrons), and gamma rays (high-energy photons), which can be harmful to living things.
The decay process is caused by an unstable ratio of protons to neutrons in the nucleus, leading to the emission of particles and radiation until a more stable configuration is reached.
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Which of these industries provides jobs and boosts the economy through product sales and advertising? (2 points)
Group of answer choices
Communications
Electronics
Tourism
Oil and g
Answer:
All of the industries listed can provide jobs and boost the economy through product sales and advertising. However, "Communications" and "Electronics" are particularly noted for their significant impact in providing jobs and boosting the economy through product sales and advertising. The communications industry includes the telecommunications and media sectors, which generate revenue through product sales and advertising. The electronics industry is a major contributor to the global economy, with products such as smartphones, laptops, and other electronics driving product sales and generating revenue through advertising.
"Tourism" is another industry that can contribute to job creation and economic growth through product sales and advertising, as it involves the sale of travel-related products and services and can generate significant revenue through advertising.
"Oil and Gas" is also an important industry that can provide jobs and boost the economy through product sales and revenue generated from the production and sale of oil and gas products.
give the structures of the two major products in the reaction shown. the starting material is a benzene ring with a chloro substituent. this reacts with b r 2 in f e b r 3.
The reaction is a substitution reaction of a chlorobenzene with bromine in the presence of iron(III) bromide (FeBr3) as a catalyst. The two major products in this reaction are ortho-brominated and para-brominated derivatives of the chlorobenzene.
The structures of these two products can be represented as follows:
Ortho-brominated product and Para-brominated product.
It's worth noting that the ortho- and para-brominating of chlorobenzene is a two-step reaction. First, the iron(III) bromide catalyst reacts with bromine to form iron(III) bromide hexahydrate (FeBr3•6H2O), which acts as a source of electrophilic bromine. The electrophilic bromine then reacts with the chlorobenzene to form the ortho- and para-brominated derivatives.
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what is the priocess where the number of protons in a nuclide is decreased whiule the mawss number rem,ains constant
Electron capture is the process where the number of protons in a nuclide is decreased while the mass number remains constant.
What is the process of electron capture?
During electron capture, an electron in an atom's inner shell is drawn into the nucleus where it combines with a proton, forming a neutron and a neutrino. The neutrino is ejected from the atom's nucleus. Since an atom loses a proton during electron capture, it changes from one element to another.
What happens to the mass number during electron capture?
Following electron capture, the atomic number is reduced by one, the neutron number is increased by one, and there is no change in mass number.
Why does electron capture decrease atomic number?
When a nucleus captures an electron, a proton changes into a neutron, and an electron-type neutrino is emitted. The atomic number goes down by one unit, accounting for the loss of a proton, and the total number of protons plus neutrons stays unchanged, accounting for the gain of a neutron.
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