Given a constant volume and rising temperature, more pressure is required because the amount of gas changes from 1 mole on the reactant side to 2 moles on the product side.
What changes take place in the pressure of the gas?Three Techniques for Increasing Gas Pressure. Increase the gas output. The "n" in the equation stands in for this.
The number of collisions between a gas's molecules and the container's walls rises as more molecules are added. In turn, pressure increases. Increase the gas's temperature. In the equation, "T" stands in for this.
P1/n1T1 = P2/n2T2
P1 = initial pressure = 0.270 atm
n1 = initial # of moles = 1
T1 = initial temperature
P2 = final pressure = ?
N2 = final moles = 2
T2 = final temperature = 3T1
(0.270) / (1)(T1) = P2 / (2)(3T1)
P2 = (0.270)(2)(3T1) / T1
P2 = 0.270 atm x 6 = 1.62 atm
Therefore, the final pressure of the gas mixture is 1.62 atm.
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how many moles of oh ions are present in 371.1 ml of 0.143 m calcium hydroxide? enter to 4 decimal places.\
Simply put, 1 mole of solute will be dissolved in 1 litre of solution in a 1-M solution. You now are aware that your solution has a volume of 19.0 mL and a molarity of 0.150 M.
What are the parameters for calculating moles of oh ions?If the solution's pOH is known, it is possible to compute the hydroxide ion concentration, [OH -], in mol L-1.
The hydroxide ion concentration in mol L-1 is expressed as the negative logarithm (to base 10) of pOH. pOH = –log 10 [OH -] [OH -] is the amount of hydroxide ions in one mole of water (mol/L or M).
You can anticipate having fewer moles of calcium hydroxide in this sample than you would have in a complete litre of solution because the volume is significantly less than 1 L.
Therefore, 0.0079 moles of oh ions are present in 371.1 ml of 0.143 m calcium hydroxide.
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Select all intermolecular forces that contribute to creating a solution of KBr in H20. lon-dipole London Dispersion H-bonding Dipole-Dipole
The intermolecular forces that contribute to creating a solution of KBr in H20 are London Dispersion, H-bonding, and Dipole-Dipole. London-dipole forces are a type of London Dispersion force.
Intermolecular forces are the attractive and repulsive forces that exist between molecules. These forces are electrostatic in nature and include van der Waals forces, London dispersion forces, hydrogen bonding, and dipole-dipole interactions.
Van der Waals forces are weak and short-range, while London dispersion forces are weak but long-range. Hydrogen bonding is strong and short-range, while dipole-dipole interactions are strong but long-range. These forces are responsible for many of the physical properties of substances, such as boiling point, melting point, and vapor pressure.
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trap?Group of answer choicesAnticline.Syncline.Fault.Anticline and fault.Syncline and fault.
A trap is a geological feature that can catch and store oil and gas. In the area of petroleum geology, the phrase "trap" is frequently employed. Because a trap.
is often generated by a mix of anticline and fault structures, the correct response is "Anticline and fault." An anticline is a sort of fold in rock strata that generates a ridge-like structure as it arches higher. A syncline is the inverse, a downward-dipping fold that generates a trough-like shape. A fault is a crack in the earth's crust caused by the movement of two pieces of rock relative to each other. When an anticline meets a fault, it forms a trap by establishing a barrier that can capture and collect material. A trap is a geological feature that can catch and store oil and gas. In the area of petroleum geology, the phrase "trap" is frequently employed. Because a trap.
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Determine the enthalpy for this reaction:
Ca(OH)2(s)+CO2(g)→CaCO3(s)+H2O(l)
Substance ΔHf∘ (kJ/mol)
CO2(g) −393. 5
Ca(OH)2(s) −986. 1
H2O(l) −285. 8
CaCO3(s) −1207. 0
H2O(g) −241. 8
The standard enthalpy change (ΔHf∘) for the reaction of calcium hydroxide with carbon dioxide to form calcium carbonate and water is −171.3 kJ/mol.
The enthalpy change (ΔH) for a reaction can be calculated using the standard enthalpy of formation (ΔHf∘) of the reactants and products.
The equation for the reaction is:
Ca(OH)2(s) + CO2(g) → CaCO3(s) + H2O(l)
The standard enthalpy change (ΔHf∘) for this reaction can be calculated as follows:
ΔHf∘ = ΔHf∘ (CaCO3) + ΔHf∘ (H2O) − ΔHf∘ (Ca(OH)2) − ΔHf∘ (CO2)
Plugging in the values from the table,
ΔHf∘ = −1207.0 kJ/mol + −285.8 kJ/mol − (−986.1 kJ/mol) − (−393.5 kJ/mol)
= −171.3 kJ/mol
Therefore, the standard enthalpy change (ΔHf∘) for the reaction of calcium hydroxide with carbon dioxide to form calcium carbonate and water is −171.3 kJ/mol.
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What is the actual mass of proton and neutron?
the actual mass of proton and neutron The simplest atoms are those of the element hydrogen, which only has atoms with one type of atom.
What exactly does a proton weigh?
The proton is a stable subatomic particle with a rest mass of 1.67262 1027 kg, or 1,836 times its mass of an electron, with a positive charge that is equal to one electron's charge in magnitude.
What exactly does a neutron weigh?
According to the atomic masses unit (u) scale, neutrons get a mass of 1.6749 1027 kg, or 940.6 MeV/c2 in MeV/c2.
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The actual mass of proton and neutron The simplest atoms are those of the element hydrogen, which only has atoms with one type of atom.
What exactly does a proton weigh?
The proton is a stable subatomic particle with a rest mass of 1.67262 1027 kg, or 1,836 times its mass of an electron, with a positive charge that is equal to one electron's charge in magnitude.
What exactly does a neutron weigh?
According to the atomic masses unit (u) scale, neutrons get a mass of 1.6749 1027 kg, or 940.6 MeV/c2 in MeV/c2.
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which toxic substance is often used to extract gold and results in harmful environmental effects?
Gold is frequently extracted using cyanide, which has harmful impacts on the environment.
One of the most harmful businesses in the world is the gold mining one. Communities may be uprooted, drinking water may become contaminated, and beautiful ecosystems may be destroyed. It endangers human health and ecosystems via cyanide and mercury pollution of water and land.
Because cyanide is so poisonous, its discharge into the environment poses serious threats to both human health and the ecosystem. Cyanide leaks have damaged agricultural fields, caused significant fish deaths, and poisoned drinking water sources.
Additionally, tailings, which are the primary wastes generated during the extraction of gold, are highly contaminated with heavy metals (HM). When these metals come into contact with water or are spread by the wind, they leak out uncontrollably into the environment.
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select the single best answer. which one of the following is not a permissible contributing structure?
The answer is C. Since C lacks any atoms that can serve as electron transfer nuclei, it cannot be a permitted contributing structure.
CH2 is positioned using oxygen's CH in the first structure. The use of current and electron mobility to read this structure is not permitted. We have given them an additional two CH since they will demand them. The negative kid will be transferred electronically here. This structure is better suited to the entire portion of three H and double bonds. The H three N double bond is the proper structure. And they'll continue. So, in the all figures we can say that C is not a permissible contributing structure.
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Balance the following chemical equation. C2H3CI+ 02 CO2+ H20+ HCI Assume the coefficient of HCl is 2. What is the balanced equation?
The balanced equation is: [tex]2C2H3Cl + 5O2 → 4CO2 + 2H2O + 2HCl[/tex]assuming the coefficient of HCl is 2.
Given the equation is: [tex]C2H3CI+ 02 = CO2+ H20+ HCI[/tex]
The number of atoms in each element on the left side of the equation must equal the number of atoms in each element on the right side of the equation for the equation to be considered balanced.
Dioxygen and Vinyl Chloride produce Carbon Dioxide, Water, and Hydrogen Chloride. Five moles of Dioxygen [O2] and two moles of Vinyl Chloride [C2H3Cl] react to produce two moles of Hydrogen Chloride [HCl], two moles of Water [H2O], and four moles of Carbon Dioxide [CO2]. It is a combustion as well as redox reaction which indicates an oxidation and reduction reaction at the same time.
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__________ is always involved in hydrolysis reactions.
Water (H2O) is always involved in hydrolysis reactions.
Hydrolysis is a chemical reaction in which water is used to break a bond between two atoms or molecules. In a hydrolysis reaction, water molecules are added to the reactants, with one molecule of water breaking apart into a hydrogen ion (H+) and a hydroxide ion (OH-). These ions then participate in the reaction, effectively breaking the bond between the two reactants and forming two new products.
Thus, water is always involved in hydrolysis reactions, serving as both the source of the reactive hydrogen and hydroxide ions and the solvent in which the reaction takes place.
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Rhodium has an fcc crystal structure, an atomic radius of 0. 1345 nm and an atomic weight of 102. 9 g/mol. Calculate the density of rhodium in grams per cubic centimeters.
4.37 g/cm³ is the density of rhodium in grams per cubic centimeters.
What is the atomic weight of rhodium?
The atomic weight of rhodium is 102.9 g/mol. This means that one mole of rhodium atoms has a mass of 102.9 grams. Rhodium is a rare, silvery-white metal that is highly reflective and has a high melting and boiling point. It is often used in catalytic converters, electroplating, and jewelry. The atomic weight of rhodium is an important factor in determining its physical and chemical properties.
To calculate the density of rhodium, we need to divide its atomic weight by its volume. The volume of an fcc crystal can be found by using the formula:
V = a^3/2
where a is the atomic radius. Substituting the values, we get:
V = (0.1345 nm)^3/2 = 2.36 x 10⁻²³ cm³ .
Therefore, the density of rhodium is 102.9 g/mol / 2.36 x 10⁻²³ cm³ = 4.37 g/cm³.
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You can use one-snip test to identify monophyletic groups − meaning that if you cut any branch on a tree, everything that falls off is a monophyletic group. why is this valid?
The one-snip test is a way to identify monophyletic groups in a phylogenetic tree, which is a diagram that shows the evolutionary relationships between species.
A monophyletic group is defined as a group of organisms that share a common ancestor and all of its descendants. When using the one-snip test, a branch is selected and cut, and everything that falls off is considered a monophyletic group. This test is valid because it ensures that all descendants of the cut branch share a common ancestor and are therefore considered a monophyletic group. If the test produces a monophyletic group, it means that the branching pattern in the tree correctly represents the evolutionary relationships between species, and that the group can be considered a clade, or a group of organisms with a shared ancestry.
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Which one of the following is NOT basic?
a) OH-
b) NO3-
c) NH3
d) SO4^-2
e) HPO4 ^-2
And explain why
The one from the following is not the basic is the correct option is b) NO₃⁻.
a) The hydroxide ion (OH⁻) is the strong base and is formed by the loss of the proton by H₂O.
b) The nitrate ion is the conjugate base of the nitric acid (HNO₃). It is formed when the nitric acid loses a proton. The nitric acid is a very strong acid, and its conjugate base is weak base.
c) NH₃ that is Ammonia is the moderately basic with the pH value of the 11.6.
d) SO₄²⁻ this basic in nature.
e) HPO₄⁻ the is basic in nature.
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Place the steps required to determine whether or not a precipitate forms when two solutionsare mixed in the correct order. Start with the first step at the top of the list.1. Note the ions present in the reactants.2. Use the solubility rules to determine whether or not either of the combinations givesan insoluble salt3. Consider possible cation-anion combinations.
1. To identify the proper order, take note of the ions present in the reactants. 2. Think about various cation-anion combinations. 3. Use the solubility criterion to determine whether one of the combinations produces an insoluble salt.
Cations are ions that are positively charged. Anions are the name for negatively charged ions. Ions are charged atoms or molecules. If one or more of an atom's electrons are lost, it will transform from a balanced atom into a positively charged cation. If an atom adds one or more electrons, it will transform from a balanced atom into a negatively charged anion. Ions come in the form of anions and cations. Because of the contrast between their electrical charges, they are drawn to one another. A cation repels other cations, whereas an anion repels another anion. An anion is an ion that has gained one or more electrons and a net negative charge.
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how many carbon atoms are in 5 moles of ethane, c2h6?
There are 6.02 x [tex]10^{24}[/tex] atoms of carbon in 5 moles of ethane.
We can see from the formula of ethane that each molecule has 2 carbon atoms so
1 mole of ethane = 2 moles of carbon atom
5 moles of ethane = 5 x 2 = 10 moles of carbon atom
Avogadro number = 6.02 x [tex]10^{23}[/tex]
Avogadro predicted that identical volumes of any two gases with comparable temperatures and weights must hold an equivalent number of particles in order for this to be true. Only if there were a distinction between atoms and molecules and certain elements, like nitrogen, genuinely existed as molecules, could this law be proven to be true. Given that Avogadro lacked terminology like "molecule" to describe his hypothesis and that his ideas encountered resistance from people like John Dalton, among others, Another chemist, Stanislao Cannizzaro, was required to give Avogadro's theories the attention they deserved. Avogadro had already passed away by the time their concepts acquired popularity.
No. of carbon atoms in 10 moles of carbon = 10 x Avogadro number
= 10 x 6.02 x [tex]10^{23}[/tex]
= 6.02 x [tex]10^{24}[/tex] atoms of carbon
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The molecular weight of ethanol (CH3CH2OH) is
46 and its density is 0.789 g/cm3.
A. What is the molarity of ethanol in beer that is 5%
ethanol by volume? [Alcohol content of beer varies from
about 4% (lite beer) to 8% (stout beer).]
B. The legal limit for a driver’s blood alcohol content
varies, but 80 mg of ethanol per 100 mL of blood (usually
referred to as a blood alcohol level of 0.08) is typical. What
is the molarity of ethanol in a person at this legal limit?
C. How many 12-oz (355-mL) bottles of 5% beer could
a 70-kg person drink and remain under the legal limit? A
70-kg person contains about 40 liters of water. Ignore the
metabolism of ethanol, and assume that the water content
of the person remains constant.
The molecular weight of ethanol (CH3CH2OH) is 46 and its density is 0.789 g/cm3
A. To calculate the molarity of ethanol in beer that is 5% ethanol by volume, we can use the following conversion:
5% ethanol by volume = 5 g ethanol / 100 mL beer
Since the density of ethanol is 0.789 g/cm3, this is equivalent to:
5 g ethanol / 100 mL beer = 5 g ethanol / (0.789 g/mL * 100 mL) = 0.0632 M ethanol
B. To calculate the molarity of ethanol in a person at a blood alcohol level of 0.08, we can use the following conversion:
80 mg ethanol / 100 mL blood = 80 mg ethanol / (0.100 L blood)
Since the molecular weight of ethanol is 46 g/mol, this is equivalent to:
80 mg ethanol / (0.100 L blood) = 80 mg ethanol / (0.100 L) * (1 g / 1000 mg) / (46 g/mol) = 0.0043 M ethanol
C. To calculate how many 12-oz (355-mL) bottles of 5% beer a 70-kg person can drink and remain under the legal limit, we can first calculate the volume of ethanol consumed and then compare it to the volume of blood in the person:
Volume of ethanol in one bottle of beer = 5 g ethanol / 0.0632 M ethanol = 79.2 mL ethanol
Volume of blood in a 70-kg person = 70 kg * 0.06 L/kg = 4.2 L
Total volume of ethanol that a 70-kg person can drink = 4.2 L * 0.0043 M ethanol / 0.0632 M ethanol = 0.48 L = 657.2 mL = 18.5 bottles
Therefore, a 70-kg person can drink 18.5 12-oz (355-mL) bottles of 5% beer and remain under the legal limit.
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A 170.00 g sample of an unidentified compound contains 29.84 g sodium, 67.49 g chromium, and 72.67 g oxygen. What is the empirical formula?
Show work
Answer:
The empirical formula : Na₂Cr₂O₇
Further explanation
Given
170 g sample contains :
29.84 g sodium, 67.49 g chromium, and 72.67 g oxygen
Required
The compound's empirical formula
Solution
mol ratio of elements :
Na : 29.84 : 23 g/mol = 1.297
Cr : 67.49 : 51,9961 g/mol = 1.297
O : 72.67 : 16 g/mol = 4.54
Divide by 1.297
Na : Cr : O = 1 : 1 : 3.5 = 2 : 2 : 7
Explanation:
a solution where no additional solute will dissolve; the solution is at equilibrium between dissolved and undissolved solute.
A solution where no additional solute will dissolve is known as a saturated solution. In this type of solution, an equilibrium exists between the dissolved solute and undissolved solute, meaning that the maximum amount of a given solute has been dissolved into the solvent.
Adding more solute will not change the concentration of the solution; the same amount of solute will remain in solution.
A saturated solution is a type of solution where the maximum amount of a given solute has been dissolved into the solvent. In this type of solution, an equilibrium exists between the dissolved solute and undissolved solute, meaning that no additional solute can be dissolved into the solvent. The amount of solute in the solution remains constant and does not increase, even if more solute is added. This is because the maximum amount of solute that can dissolve in the solvent has already been reached.
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magnesium has three naturally occuring isotopes. the masses and bundances of the isotopes are given in the table below. what is the average atomic mass of mg?
According to the question,Average atomic mass of Mg = 24.3050.
What is the mass ?Mass is the measure of the amount of matter in an object. It is related to the concept of weight, which is the measure of the gravitational force that acts on an object. Mass can be measured in a variety of ways, including weighing, using a beam balance, or by using an instrument such as a spring scale. Mass is usually measured in units of kilograms or grams. Mass is an important concept in physics and is one of the properties used to describe an object's motion.
24Mg (78.99%)
25Mg (10.00%)
26Mg (11.01%)
Average atomic mass of Mg = 24.3050
24Mg*(78.99%) + 25Mg*(10.00%) + 26Mg*(11.01%) = 24.3050
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Which of the following amino acid side chains can form hydrogen bonds with each other, ultimately contributing to tertiary structure? Assume physiological pH. Asn and Val Ala and Pro Phe and Tyr Tyr and Gln Leu and Arg Asp and Ile
The pairs of amino acid side chains that can form hydrogen bonds with each other are: Asn and Gln, Tyr and Phe, and Asp and Glu.
Amino acid side chains can form hydrogen bonds with each other, which ultimately contributes to tertiary structure. Some common examples include:
Asn and Gln: Asn and Gln both contain amide groups (-CONH-) in their side chains, which can participate in hydrogen bonding.
Tyr and Phe: Tyrosine and Phenylalanine both contain aromatic rings in their side chains, which can participate in pi-stacking interactions and hydrogen bonding with other residues.
Asp and Glu: Aspartic acid and Glutamic acid both contain carboxyl groups (-COO-) in their side chains, which can participate in hydrogen bonding.
So, the pairs of amino acid side chains that can form hydrogen bonds with each other are: Asn and Gln, Tyr and Phe, and Asp and Glu.
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Calculate the molar mass of :
a) NH⁴
b) LiBr
The molar mass of NH₄ is 18 g/mole while that of compound of lithium bromide is 86.84 g/mole.
What is molar mass?Molar mass of a compound or a molecule is defined as the mass of the elements which are present in it.The molar mass is considered to be a bulk quantity not a molecular quantity. It is often an average of the of the masses at many instances.
The molecular mass and formula mass are used as synonym for the molar mass.It does not depend on the amount of substance which is present in the sample.It has units of gram/mole.
Molar mass of NH₄= 14+ 4= 18 g/mole while that of lithium bromide =6.941+ 79.904=86.84 g/mole.
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the prescribing clinician orders aluminum hydroxide 20 ml po qid. the pharmacy sends aluminum hydroxide, 320 mg per 5 ml. how many mg will the patient receive per dose? mg. round to the nearest whole number if rounding needed. do not include unit of measurement in the answer.
Given that 2.4g is ordered and the accessible medication has 400 mg/5ml, the nurse should give 30ml of the medication.
Magnesium hydroxide sometimes referred to as Milk of Magnesia, is a magnesium salt that is frequently utilized in medical settings. Magnesium hydroxide is frequently used as an antacid to neutralize stomach acids and prevent indigestion and heartburn because it is mildly basic and non-toxic. Additionally, it has medical applications as a laxative, antiperspirant, sore therapy agent, and wastewater treatment. dosage recommended = 2.4 grams. You can get milligrams out of this by multiplying by 1000: The recommended dosage is (2.4 1000) mg. Dosage prescribed: 2400 mg The dosage of the drug is 400 mg/5 ml. Magnesium hydroxide is 400 mg available. Divide the available amount by 2400mg of magnesium hydroxide to get how many doses are required. The dosage is 2400 mg, 400 mg, and 5 ml. Size: 30 ml.
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What are the uses of magnesium hydroxide?
Magnesium hydroxide is used to treat occasional constipation in children and adults on a short-term basis .
What are compounds ?
A compound is a substance consisting of two or more elements chemically combined in a fixed ratio. They differ from mixtures consisting of two or more substances physically mixed without chemical bonding. Compounds have their own physical and chemical properties that differ from those of individual elements. For example, the compound water (H2O) has different properties (boiling point, density, solubility, etc.) than its components hydrogen (H2) and oxygen (O2 ).
Compounds are formed by chemical reactions in which atoms of different elements combine to form new substances. The formation of a compound can be represented by a chemical formula that indicates the type and number of atoms in the compound.
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_____ is the smallest chemical unit of a type of pure substance.
(a) A cell
(b) A molecule
(c) An amino acid
(d) An atom
(e) A proton
The order in which amino acids are linked in peptides is given
a. from the C-terminal to the N-terminal end
b. from the N-terminal to the C-terminal end
c. in alphabetical order
d. in order of increasing molecular weights of the amino acid residues
Option b. from the N-terminal to the C-terminal end. A peptide is a molecule composed of two or more amino acids linked by peptide bonds.
The order in which these amino acids are linked together determines the sequence of the peptide. The amino acid at one end of the peptide is referred to as the N-terminal (amino) end, and the amino acid at the other end is referred to as the C-terminal (carboxyl) end. When a peptide is synthesized, the amino acids are added to the molecule one by one, starting from the N-terminal end and proceeding toward the C-terminal end. This means that the sequence of amino acids in a peptide is from the N-terminal end to the C-terminal end. This information is critical for understanding the structure and function of peptides, proteins, and enzymes.
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A gram of cola contains about 39 grams of sucrose, C₁₂H₂₂O₁₁. How many moles of sucrose does this represent?
Choose matching term
1. 0.11 mol
2. 0.16 mol
3. 0.111 mol
4. 0.12 mol
The moles of 39 grams sucrose (C₁₂H₂₂O₁₁) does represent in a gram of cola is 0.11 moles. The correct answer is 3.
How to determine the mole?Avogadro's number (6.022 x 10²³) of atoms and molecules is used to estimate material concentrations as moles (mol).
Chemical reactions depend on the mole unit and the capacity to transform masses in grams to moles. By dividing the mass in g by the molar mass, which results in the amount in moles, one can determine the number of moles of a substance present in a sample.
Hence,
Sugar molecule mass:
= (12 x 12) + (22 x 1) + (11 x 16)
= 342 gr/mol
Moles of sucrose = mass / molar mass
= 39 / 342
= 0.11 moles
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if the molecular formula of a compound is c4h8, what is the empirical formula for the compound?
CnH2n
In the case of C4H8, because there are 4 carbon atoms and there are 8 hydrogen atoms the general formula must be CnH2n where n can be any number.
how are temperature and the boiling point related? in your own words, explain how water can boil at room temperature.
Temperature and boiling point are directly related. In solutions, ΔTb = i×Kb×m where elevation in boiling point is directly related to molality as well.
A substance's boiling point is the temperature at which it changes states from a liquid to a gas. This phase change occurs when the liquid's vapour pressure is equal to the atmospheric pressure and the temperature at which this occurs is known as the boiling point. At standard atmospheric pressure(1.01 bar), the normal boiling point of water is 100°C (100+273 = 373K). Temperature and boiling point are directly related. When the temperature of a substance rises, so does its vapour pressure. When the liquid's vapour pressure reaches atmospheric pressure, it begins to boil and turn into a gas. However, changes in atmospheric pressure can affect a substance's boiling point. Atmospheric pressure is lower than that at sea level at higher altitudes. Hence, water at high altitudes boils at lower than 100°C temperature, and in some cases, at room temperature.
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What is the average atomic mass of chlorine if it has isotopes of masses 36.96590 and 34.96885, which are 24.47% and 75.53% abundant, respectively?
The average atomic mass of chlorine is 35.0351 amu if it has isotopes of masses 36.96 and 34.96 respectively .
Why does chlorine have an atomic mass of 35.5?Chlorine has a relative atomic mass of 35. 5. The fact that chlorine can be found in two isotopes with atomic masses of 35 and 37 in a ratio of 3:1 makes its relative atomic mass possible. Because of its 35 relative atomic mass, this is the case.
Chlorine's average atomic mass is calculated as follows:average atomic mass = (M1 × 0.2447) + (M2 × 0.7553)
The following equations can be used to replace the masses of the two isotopes:
average atomic mass = (36.96590 × 0.2447) + (34.96885 × 0.7553)
= 8.96857 + 26.06653
= 35.03510 atomic mass units,
Chlorine element :The chemical element chlorine has the atomic number 17 and the symbol Cl. It is the second-lightest halogen and appears in the periodic table between bromine and fluorine. Most of its properties lie in between them. At room temperature, chlorine is a gas that is yellow-green.
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What is the formula mass (molar mass) of sucrose (C12H24O8), a fat?
Responses
44 g/mol
280 g/mol
296 g/mol
386 g/mol
The formula mass (molar mass) of sucrose (C12H24O8), a fat is 296 g/mol. Therefore, option C is correct.
What is molar mass ?Molecular weight M is a chemical compound's mass divided by its amount of substance measured in moles. MB = m/nB, where m is the total mass of a pure substance sample and nB is the amount of substance B given in moles.
An element's characteristic molar mass is simply its atomic mass in g/mol. To calculate the molar mass of a compound with multiple atoms, add all the constituent atoms' atomic masses.
The molar mass of sucrose (C12H24O8)
= 12 × 12 + 1 × 24 + 16 × 8
= 144 + 24 + 128
= 296 g/mol
Thus, option C is correct.
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Which one of the following corresponds to one mole of a gas at S.T.P.?A. P = 1 atm, T = 273 C, V = 22.4 litreB. P = 1 atm, T = 273 K, V = 22.4 litre C. P = 1 atm, T = 273 K, V = 1 litreD. P = 0.5 atm, T = 273 K, V = 2 litre
The mole is the unit of measurement for the amount of a substance. At standard temperature and pressure (STP), one mole of a gas has a defined volume, pressure, and temperature.
A. P = 1 atm, T = 273 C, V = 22.4 litre: This option is incorrect because the temperature is given in degrees Celsius (273 C) rather than Kelvin (273 K). The temperature should be given in Kelvin for the conditions to be considered STP.
B. P = 1 atm, T = 273 K, V = 22.4 litre: This option is correct. At STP, one mole of a gas has a pressure of 1 atmosphere (atm), a temperature of 273 Kelvin (K), and a volume of 22.4 liters. This volume is known as the molar volume of a gas at STP.
C. P = 1 atm, T = 273 K, V = 1 litre: This option is incorrect because the volume is much smaller than the molar volume of a gas at STP, which is 22.4 liters.
D. P = 0.5 atm, T = 273 K, V = 2 litre: This option is incorrect because both the pressure and volume are not equal to their respective STP values. The pressure at STP is 1 atm and the molar volume is 22.4 liters.
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