You will need 60ml of the 75% solution to add to the 240ml of a 25% alcohol mixture.
A solution is a specific kind of homogenous mixture made up of two or more components that is used in chemistry. A solute is a substance that has been dissolved in a solvent, which is the other substance in the mixture. The solvent particles will pull the solute particles apart and surround them if the attractive forces between the solvent and solute particles are stronger than the attractive forces holding the solute particles together. The particles of the solute that are enclosed by the solid solute subsequently disperse into the solution.
Now m be the amount of the 75% mixture and you have 240ml of the 25% alcohol mixture.
75% m + 25%(240) = 35%(m + 240)
75/100m + 25/100 × 240 = 35/100m + 35/100 × 240
divide all by 5 to get,
15/20m + 5/20 × 240 = 7/20m + 7/20 × 240
multiply by 20 to get
15m + 1200 = 7m + 1680
Then it will reduces to,
8m = 480
m = 60ml.
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As concentration increases, a solution's vapor pressure______ and its osmotic pressure _________A. increases, increases B. increases, decreases C. decreases, increases D. decreases, decreases E. increases, stays the same
As concentration increases, a solution's vapor pressure decreases and its osmotic pressure increases. Hence, option A is correct.
What happens when concentration increases?Osmotic pressure of a solution is proportional to the molar concentration of solute particles in the solution and as soon as the solute molecules increases, osmotic pressure of solution increase.
When non-volatile solute is dissolved in volatile solvent, vapor pressure of the solvent is reduced. As concentration of the solute increases, then the vapor pressure of the solvent decreases.
Po = pgh= psp log ; where Po is osmotic pressure corresponding to a solution at the bottom of column and solvent pressure p, p is mean density of the column, h is its height.
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Because there are only 26 letters in the alphabet, we could not give every element and one-letter symbol. We would have run out of letters after element 26 (Iron). To solve this problem, most elements have a two-letter symbol.
When an element has a two-letter symbol, what is the rule that must be followed?
Question 1 options:
Both letters are lower-case.
There is no rule; capitalization has no significance in chemistry.
The first letter is capitalized and the the second letter is lower-case.
Both letters are capitalized.
When an element has a two-letter symbol, the rule is that the first letter is capitalized while the second letter is in lowercase. Option 3.
Writing two-letter symbols of elementsIn writing two-letter symbols of elements, the first letter is usually capitalized while the second letter is retained in lowercase. Some examples are highlighted below:
The Latin name of silver is Argentum. Thus, the symbol of silver is Ag.The Latin name of mercury is Hydrargyrum. Thus, the chemical symbol of mercury is HgLead is PbIron is FeIn other words, the number one rule guiding the writing of two-letter chemical symbols is that the first letter must be in the capital while the second letter would be in lowercase.
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how many grams in a mg
In the metric system, a milligram equals one gram. a unit being used measuring systems to express weight and mass.
How would a gram have weight or mass?Not weight but mass is measured in milligrams. Mass would be a measurement of how much matter an object contains, whereas weight relates to the earth's gravitational pull on it. Knowing an object's mass is essential since it allows you to determine how so much effort will be needed to move it.
What dimensions does a gram have?A gram is a unit of mass equal to one thousandth of a kilogram, or roughly the amount of one cubic millimeter of water.
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what is the mass of 7.11x10^24 particles of potassium oxide?
If 4. 52g of the precipitate is formed, how many grams of sodium chloride reacted?
If 4. 52g of the precipitate is formed, there would be 1.8 grams of sodium chloride reacted.
First we should write the balance reaction
AgNO₃(aq)+NaCl(aq)→AgCl(s)⏐↓+NaNO₃(aq)
We can observe that there is a 1:1 reaction. As a result, producing 1 mole of the precipitate from 1 mole of sodium chloride (AgCl).
In this case,
we should find the moles of sodium chloride used by dividing the mass by the mass molar of sodium chloride.
Precipitate formed in terms of moles: 4.52g/143.32 g/mol
The amount of precipitate that produced was 0.0315 moles.
Thus, 0.0315 moles of NaCl and 0.0315 moles of precipitate were generated.
Therefore NaCl reaction mass is 0.0315 moles times 58.5 g/mol, or 1.8 g.
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How do we use this percent composition in our daily lives?
Answer: you could use it for sceinstest stuff hom someting broke down
Explanation:
Suppose you are hiking through the woods and see many flowers of different colors, shapes, and sizes. You decide to create a taxonomic key to help you identify the flowers. What
characteristics would you include in the key?
an amino acid that does not derive its carbon skeleton at least in part from oxaloacetate is
Proline is an amino acid that does not, at least partially, get its carbon skeleton from oxaloacetate. Because proline is a nonessential amino acid, the body may make it from other molecules.
Amino and carboxylic acid functional groups can both be found in organic compounds known as amino acids. Of the many different amino acids found in nature, alpha-amino acids, which are the building blocks of proteins, are by far the most important. There are just 22 alpha amino acids in the genetic code. The primary structural functional groups of alpha, beta, gamma, or delta-amino acids can be categorised; further classifications relate to polarity, ionisation, and the type of side chain group (aliphatic, acyclic, aromatic, containing hydroxyl or sulfur, etc.). After water, proteins made of amino acid residues make up the second-largest portion of human muscles and others tissue.
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Help me figure out what the answer to this is, organic chemistry confuses me
The name of the compound is 1- methyl cyclopropane.
How do you name the cyclo alkane?
Cycloalkenes are named using the same basic system as alkenes, with a few additional considerations.
Identify the parent hydrocarbon: The parent hydrocarbon is the longest continuous chain of carbon atoms that includes the double bond.
Number the parent chain: Number the carbon atoms in the parent chain such that the double bond has the lowest possible number.
Give the prefix "cyclo-" to indicate the presence of a ring: The prefix "cyclo-" is added to indicate that the parent chain forms a ring.
Indicate the location of the double bond: The location of the double bond is indicated by listing the two numbers of the carbons in the double bond.
Name the alkene: Finally, the suffix "-ene" is added to indicate the presence of a double bond.
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Select the correct net ionic equation for the ionic equation given below. Ca(s) + 2H+ (aq) + 2Cr (aq) + Ca(aq) + H2(g) + 2Cl(aq) Click the answer you think is right. A. Ca(s) + 2Cr (aq) → Ca?"(aq) + 2Cl(aq) B. Ca(s) + 2H" (aq) → Ca" (aq) + H (9) C. There is no net ionic equation. D. 2H(aq) → H,9)
The correct net ionic equation for the ionic equation given below is Ca(s) + 2Cr (aq) → Ca"(aq) + 2Cl(aq).
What is the equation ?The equation is a mathematical statement that shows the relationship between different values. It usually consists of an equal sign (=) and two or more variables that are related to each other. The variables can be numbers, symbols or other mathematical objects. By manipulating the equation, different values can be found for the variables involved. Equations are used to describe many different physical concepts, such as motion, force, energy, and chemical reactions.They can also be used to solve problems in fields such as economics, engineering, and mathematics.
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Which properties can be used to determine whether a substance is a liquid or a plasma?.
The properties can be used to determine whether a substance is a liquid or a plasma are: temperature, electron density, pressure, magnetic field, conductivity.
What is plasma?
Plasma is a state of matter consisting of charged particles, such as electrons, protons, and ions, that are held together by an electric field. It can be created in a laboratory or exist naturally in interstellar space, the Earth's atmosphere, and the Sun. Plasma is often referred to as the fourth state of matter, since it is different from the traditional three states of matter: solid, liquid and gas. Plasma has unique properties, such as being able to conduct electricity, which can be used to generate electricity in devices such as televisions and fluorescent lights.
If the temperature of a substance is high enough, it can exist as a plasma. Plasmas have much higher electron density than liquids. Plasmas are typically formed under high pressure, while liquids are formed under low pressure. Plasmas typically contain charged particles that can be affected by a magnetic field. Plasmas are typically better electrical conductors than liquids.
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A 5. 00-cm cube of magnesium has a mass of 217. 501 g. What is the density of magnesium metal?
densitydensity is the mass per unit volume. It is given by the formula; [tex]Density=\frac{mass}{volume}[/tex] . The density of given magnesium metal is 43.5002[tex]g/cm^{3}[/tex].
Use the following formula to calculate magnesium density: -[tex]P=\frac{m}{v}[/tex] ( where, p represents the density of the object, m represents the mass of the object and v represents volume of the object) ( where, p represents the density of the object, m represents the mass of the object and v represents volume of the object).
Substitute the following values into the formula: m=217.501g, v=5.00cm3, and p=x.
By plugging the values into the formula, we get: x= 217.501/5.00= 43.5002[tex]g/cm^{3}[/tex].
As a result, the density of the given magnesium metal is 43.5002g/cm3.
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The chemical equation below shows the reaction between tin (Sn) and hydrogen fluoride (HF).
Sn + 2HF Right arrow. SnF2 + H2
The molar mass of HF is 20.01 g/mol. How many moles of Sn are required to react completely with 40 g of HF?
1 mole
2 moles
3 moles
4 moles
Answer:
1 mole of Sn
Explanation:
The balanced equation tells us that 2 moles of HF react with every 1 mole of Sn. That's a molar ratio of 1/2. We need half as many moles of Sn as we have of HF. Lets determine the moles of HF that are in 40 g of the material. The molar mass of HF is (1 + 19) = 20 grams/mole.
40 grams of HF means we have 2 moles of HF: (40g HF)/(20 grams/mole HF) = 2 moles HF. Since the molar ratio is 1/2, we only need 1 mole of Sn for this reaction.
what is the highlighted 2 in this portion of a chemical reaction called? 3h20 T/F
The highlighted "2" in this portion of a chemical reaction is the coefficient of the molecule, indicating the number of molecules present in the reaction.
The coefficient is used to balance chemical reactions and ensure that the number of atoms of each element remains constant before and after the reaction.
A chemical reaction is a process that results in the transformation of one set of chemical substances into another. It involves the rearrangement of atoms and the formation and breaking of chemical bonds. Chemical reactions can be represented using chemical equations, which indicate the reactants (the starting substances) on the left side and the products (the resulting substances) on the right side, separated by an arrow.
The rate of a chemical reaction depends on several factors, including the concentration of the reactants, the presence of a catalyst, and the temperature. Understanding chemical reactions is important in many areas of chemistry, including the design of new materials, the development of new energy sources, and the understanding of biological processes.
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Bed bugs might sound like an old-fashioned problem, but now they are back with a vengeance. Fifty years ago, the blood-sucking pests were nearly eradicated in the united states thanks in part to the use of pesticides like ddt. Today, they are creeping over sheets and tormenting sleepers across the country. New york was recently declared america's most bed-bug-infested city in america. In the past, we countered the bed bugs by using pesticides called pyrethrins and pyrethroids. These compounds work by attacking the nervous system. Insects have channels in the membranes of their nerve cells that can be opened to allow sodium into the cells, triggering a nerve impulse. Pyrethrins and pyrethroids alter the nervous system by binding to the sodium channels, locking them in the open position. This allows sodium to pour into the cell continuously, causing the nerve to fire repeatedly and eventually leading to paralysis. Todays bed bugs seem to be more resistant to the chemicals that previously killed them. Cases of resistance have been reported in all classes of pests: crop diseases, human diseases, weeds, rodents, and insects, with crises in insect control beginning shortly after the introduction of pesticide use in the 20th century. Why do insect pests become resistant so readily to the pesticides used for control?.
The use of pesticides widely and frequently, genetic heterogeneity among the insect population, and the process of natural selection all play a role in the fast evolution of pesticide resistance.
Due to natural selection, pest insects develop a resistance to insecticides. The insects that are most vulnerable to pesticides die out when pesticides are employed to manage bug populations, leaving behind the insects that are less vulnerable. These less vulnerable insects eventually reproduce and pass on their resistance to their progeny.
In addition, the extensive and regular use of pesticides can hasten the development of resistance. When pesticides are used frequently and in large quantities, the population of pests that are resistant to them will rise.
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If the pressure of each gas is increased at constant temperature until condensation occurs, which gas will condense at the lowest pressure? responses.
Butane is the gas that will condense at the lowest pressure.
Condensation is the process through which matter transitions from its initial gaseous state into its final liquid state. For instance, condensation happens when water vapour in the air, which is in its gaseous state, comes into touch with a colder surface and turns into liquid water.
The process of condensation, which is the reverse of evaporation, converts airborne water vapor to liquid water. Because it causes clouds to develop, condensation is essential to the water cycle.
When warm air meets cold surfaces or when your home is too humid, condensation happens. This moisture-rich heated air immediately cools down and releases the water, which condenses into liquid droplets on the chilly surface when it comes into contact with it.
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f the mass percent of sulfur in al2(so4)3 is 28.1%, what is the mass of sulfur atoms in grams in 14.8 grams of al2(so4)3?
The mass of sulfur atoms in grams in 14.8 grams of al2(so4)3 is equal to 3.9g
We are informed that this chemical contains 28.1% Sulphur by mass.
This implies that any sample of this substance Additionally, this molecule is Al2 SO4 3. Therefore, sulphur will account for 0.1% of the mass in any sample size of this 28. Therefore, 28.1% of that, whether we have a one g sample or a 1000 g sample, will be attributed to the sulphur. We therefore have a 14 g sample in this inquiry. In order to locate the sulphur mass. Okay, we must multiply the percentage of 28.1 by mass by the sample size, which is 14 g. The quantity of Sulphur in this sample is therefore going to be 3.9 g And I rounded that to two significant digits since 14 only had two significant digits.
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The ions formed when mgi₂ dissociates in water are?
When magnesium iodide (MgI₂) dissociates in water, it produces two Mg2+ cations and two I- anions, according to the following equation:
MgI₂(aq) → Mg2+(aq) + 2I-(aq).Chemical reactions are processes in which atoms or molecules of one or more substances are rearranged to form new substances with different properties. Chemical reactions involve the breaking and forming of chemical bonds, which releases or absorbs energy.
For example, a reaction between hydrogen and oxygen can form water, which has different properties than the two gases. During a chemical reaction, the starting materials, or reactants, are transformed into new substances, or products. Chemical equations can be used to represent chemical reactions, which allow us to calculate the amount of reactants and products that are involved.
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A system that does no work but which transfers heat to the surroundings has ___________________.
Answer
a. q < 0, ?E > 0
b. q > 0, ?E < 0
c. q > 0, ?E > 0
d. q < 0, ?E < 0
e. q < 0, ?E = 0
A system that does no work but which transfers heat to the surroundings has , the correct option is d) q < 0 , ΔE < 0.
The expression between the heat , the work and the internal energy is as follows :
ΔE = q + w
If no work is done by the system means w will be zero, The formula for the internal energy is as follows :
ΔE = q + w
ΔE = -q + 0
ΔE = -q
The internal energy is less than zero and the value of the heat is less than the zero.
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what is observed when water (in the presence of an acid) is added to 2-methyl-2-pentene?
When we add the water in the presence of the sulfuric acid to 2-methyl-2-pentene , then the product formed is 2-methyl-2-pentanol.
The sulfuric acid acts as the catalyst, in the reaction when the water to added to the carbon double bond of the 2-methyl-2-pentene molecule. The reaction is expressed as :
CH₃-C = CH₂-CH₂-CH₂ + H₂O + H₂SO₄----> CH₃-C(CH₃) - CH₂ - CH₂ - CH₂
| |
CH₃ OH
2-methyl-2-pentene 2-methyl-2-pentanol
This is an example of the addition reaction. The reaction is the exothermic, that means it releases the heat energy and the hydroxyl group will attached to the carbon atom, that is the alcohol-functional group.
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True /False 1. Aluminum chloride is a chemical compound with a chemical formula equivalent to AlCl3 or Al3Cl3.
False; the true sentence is: Aluminum chloride is a chemical compound with the chemical formula equivalent to AlCl3.
What is a chemical compound?
A chemical compound is a substance composed of two or more elements chemically combined in a fixed proportion. An example of a chemical compound is water (H2O), which is composed of two hydrogen atoms and one oxygen atom chemically combined in a fixed ratio.
Chemical compounds have unique properties that are different from the elements that make them up, and they can only be separated into their constituent elements through chemical reactions.
For example, water can be separated into hydrogen and oxygen gas by electrolysis, but these elements cannot be combined to form water unless they are subjected to the right conditions of temperature, pressure, and energy.
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hydrogen has the same number of valence electrons as which family
All of the elements in Group I (alkali metals and hydrogen) have one electron in the outer shell.
All of the elements in Group 1 only have one valence electron. Examples include lithium (Li), sodium, and hydrogen (H) (Na). Group 18 elements all have eight valence electrons (except for helium, which has a total of just two electrons). Neon (Ne), argon (Ar), and krypton are some examples (Kr). The periodic table's hydrogen is a particularly unique element that does not fall under any family. Despite being a member of Group I, hydrogen is not an alkali metal. The group IV elements and carbon share the most similarities with hydrogen in terms of thermodynamic parameters (ionization energy, electron affinity).
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TRUE or FALSE. Believing that, with training, you will be able to run two miles without stopping by the end of the semester demonstrates self-efficacy.
The statement "Believing that, with training, you will be able to run two miles without stopping by the end of the semester demonstrates self-efficacy." is True.
Self-efficacy is an individual's belief in their ability to successfully perform a specific task or complete a particular goal. Believing that, with training, you will be able to run two miles without stopping by the end of the semester is a demonstration of self-efficacy. This belief in one's abilities can have a significant impact on motivation, effort, and performance, as individuals who have high self-efficacy are more likely to set challenging goals and persist in the face of obstacles and setbacks.
Self-efficacy can be developed and strengthened through various experiences, including mastery experiences (successes), vicarious experiences (observing others), emotional and physiological states, and social persuasion. An individual's self-efficacy can also be affected by situational and dispositional factors, such as their confidence, past experiences, and the difficulty of the task at hand.
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Please help will give brainliest
Changes in precipitation and snowmelt patterns, withdrawal of ground water for drinking, irrigation, and other human uses, and impervious paved surfaces that prevent precipitation from recharging ground water are all stressors that can deplete aquifers. It may take thousands of years to replenish some deep aquifers.
What are the two main causes of groundwater pollution?There are two types of groundwater contaminants: point sources and distributed, or non-point sources. Point sources include landfills, leaking gasoline storage tanks, leaking septic tanks, and accidental spills.
Deforestation, unscientific agricultural methods, chemical effluents from industries, and a lack of sanitation all contribute to groundwater pollution, rendering it unusable.
Thus, Some deep aquifers may take thousands of years to fill again.
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reaction order is always defined in terms of both reactant and product concentrations. True or false?
Answer:
False
Explanation:
Reaction order is always defined in terms of both reactant and product concentrations. True or false?
False. The number of species whose concentration directly influences the rate of reaction is indicated by the sequence of reactions. The reactant concentrations are always used to specify the sequence of the reactions (but not with product concentrations).
The power dependence of the rate on the concentration of each reactant is the definition of the order of reaction. The rate law of a reaction can be used to fully comprehend the composition of the reaction mixture once that rule has been established. In other words, the reaction order is an exponent that increases the concentration of a certain species, and it demonstrates the extent to which this concentration impacts the rate of reaction. Additionally, it shows the range in which the species has a large impact.
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calculate the ph of a 6.5×10−2 m solution of butyric acid.
pH of a 6.5 × 10^-2 M solution of butyric acid is 6.07 and the calculation part is below.
The pH of a 6.5 × 10^-2 M solution of butyric acid can be calculated as follows:
Calculate the concentration of hydronium ions (H3O+) in the solution:
Butyric acid (HC4H7O2) is a weak acid, which means that only a small fraction of it dissociates into its ions in solution. The dissociation reaction can be represented as follows:
HC4H7O2 + H2O ⇌ H3O+ + C4H7O2-
The concentration of hydronium ions can be calculated using the acid dissociation constant (Ka) for butyric acid and the initial concentration of butyric acid:
Ka = [H3O+][C4H7O2-] / [HC4H7O2]
[H3O+] = Ka * [HC4H7O2] = 1.3 × 10^-5 * 6.5 × 10^-2 = 8.45 × 10^-7
Calculate the pH:
The pH of a solution is defined as the negative logarithm of the hydronium ion concentration:
pH = -log[H3O+] = -log(8.45 × 10^-7) = 6.07
So, the pH of a 6.5 × 10^-2 M solution of butyric acid is 6.07.
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The pKa values for arginine are: pK1 = 2.17, pK2 = 9.04, pKR = 12.48.
a. Draw the structure of arginine at pH 11.
b. Estimate the pI of arginine. Show your work.
The pKa values for arginine are: pK1 = 2.17, pK2 = 9.04, pKR = 12.48.
a. Structure of arginine at pH 11 is attached in the image below.
b.The pI of arginine can be estimated using the pKa values as follows:
pI = (pK1 + pK2) / 2
In this case:
pI = (2.17 + 9.04) / 2 = 5.605
So, the estimated pI of arginine is approximately 5.605.
Amino acids contain both acidic and basic functional groups. The isoelectric point or pI is the pH of a solution wherein the net charge of the amino acid becomes zero. It can be calculated by taking the average of the pKa values.
Arginine (Arg or A) have 3
pKa values:
pKa(3) =1.82;
pKa(3) = 8.99;
pKa(3) = 12.48
What is the pI for arginine?
10.76
The isoelectric point (pI) of arginine is 10.76, which is the highest among the protein amino acids.
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P
1.2 mol Zn and 5.5 mol HCl react according
to the equation
Zn + 2HCl → ZnCl₂ + H₂.
If the limiting reactant is Zn, calculate the
amount of ZnCl₂ formed.
Answer in units of mol. Answer in units of
mol.
outs
porad
mol.
******
002 (part 2 of 2) 10.0 points
Calculate the amount of H2₂ formed.
Answer in units of mol.
Taking into account the reaction stoichiometry, 1.2 moles of ZnCl₂ and 1.2 moles of H₂ are formed if 1.2 mol Zn and 5.5 mol HCl react and the limiting reactant is Zn.
Reaction stoichiometryThe balanced reaction is:
Zn + 2 HCl → ZnCl₂ + H₂
By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:
Zn: 1 moleHCl: 2 molesZnCl₂: 1 moleH₂: 1 moleMass of each product formedThe following rules of three can be applied, considering the limiting reactant:
if by reaction stoichiometry 1 mole of Zn form 1 mole of ZnCl₂, 1.2 moles of Zn form how many moles of ZnCl₂?
moles of ZnCl₂= (1.2 moles of Zn× 1 mole of ZnCl₂)÷ 1 mole of Zn
moles of ZnCl₂= 1.2 moles
if by reaction stoichiometry 1 mole of Zn form 1 mole of H₂, 1.2 moles of Zn form how many moles of H₂?
moles of H₂= (1.2 moles of Zn× 1 mole of H₂)÷ 1 mole of Zn
moles of H₂= 1.2 moles
Finally, 1.2 moles of ZnCl₂ and 1.2 moles of H₂ are formed.
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the lattice energy of naoh is -900 kj/mol. when 2.990 g of naoh is dissolved in water, 3.33 kj of heat is released. calculate the enthalpy of hydration of naoh.
The lattice energy of NaOH is -900 kj/mol. when 2.990 g of naoh is dissolved in water, 3.33 kj of heat is released. The enthalpy of hydration of naoh is 70.6 kJ/mol.
The enthalpy of hydration is the amount of heat released or absorbed when a substance dissolves in water.
To calculate it, we need to subtract the heat of solution due to the breaking of the solid lattice of the solute from the total heat released during the solution process.
First, we need to convert the mass of NaOH to moles:
2.990 g / (40.0 g/mol) = 0.07475 moles
Next, we can calculate the heat of solution due to the breaking of the solid lattice:
0.07475 moles * (-900 kJ/mol) = -67.3 kJ
Finally, we can calculate the enthalpy of hydration:
ΔHhydration = ΔHsolution - ΔHlattice
ΔHhydration = 3.33 kJ - (-67.3 kJ) = 70.6 kJ/mol
So, the enthalpy of hydration of NaOH is 70.6 kJ/mol.
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A half-cell containing Hg2 +2 and Hg is connected to a half-cell containing Mg+2 and Mg to form a voltaic cell. Determine the proper direction for each half-cell reaction to assure a spontaneous, complete cell reaction. Find the value of the complete cell electrode potential (E°).
Answer:
Look up the standard reduction potentials for
Br and Mg. I find the following:Mg2+ +2e-=>
Mgls) E = -2.38 VBr2() +2e-==> 2Br-(aq) E°