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chemistry a molecular approach

Questions and Answers of Chemistry A Molecular Approach

What is the Tyndall effect, and how can it be used to help identify colloidal dispersions?
Pick an appropriate solvent from Table 14.3 to dissolve each substance. State the kind of intermolecular forces that would occur between the solute and solvent in each case.a. Motor oil (nonpolar)b.
What keeps the particles in a colloidal dispersion from coalescing?
Pick an appropriate solvent from Table 14.3 to dissolve each substance. State the kind of intermolecular forces that would occur between the solute and solvent in each case.a. Isopropyl alcohol
Which molecule would you expect to be more soluble in water:CH3CH2CH2OH or HOCH2CH2CH2OH?
For each compound, would you expect greater solubility in water or in hexane? Indicate the kinds of intermolecular forces that occur between the solute and the solvent in which the molecule is most
Which molecule would you expect to be more soluble in water:CCl4 or CH2Cl2?
For each compound, would you expect greater solubility in water or in hexane? Indicate the kinds of intermolecular forces that would occur between the solute and the solvent in which the molecule is
When ammonium chloride (NH4Cl) is dissolved in water, the solution becomes colder.a. Is the dissolution of ammonium chloride endothermic or exothermic?b. What can you conclude about the relative
When lithium iodide (LiI) is dissolved in water, the solution becomes hotter.a. Is the dissolution of lithium iodide endothermic or exothermic?b. What can you conclude about the relative magnitudes
Use the data to calculate the heats of hydration of lithium chloride and sodium chloride. Which of the two cations, lithium or sodium, has stronger ion–dipole interactions with water? Why?
Silver nitrate has a lattice energy of -820 kJ/mol and a heat of solution of 22.6 kJ/mol. Calculate the heat of hydration for silver nitrate.
Lithium iodide has a lattice energy of -7.3 * 102 kJ/mol and a heat of hydration of -793 kJ/mol. Find the heat of solution for lithium iodide and determine how much heat is evolved or absorbed when
Potassium nitrate has a lattice energy of -163.8 kcal/mol and a heat of hydration of -155.5 kcal/mol. How much potassium nitrate has to dissolve in water to absorb 1.00 * 102 kJ of heat?
A solution contains 25 g of NaCl per 100.0 g of water at 25 °C. Is the solution unsaturated, saturated, or supersaturated?
A solution contains 32 g of KNO3 per 100.0 g of water at 25 °C. Is the solution unsaturated, saturated, or supersaturated?
A KNO3 solution containing 45 g of KNO3 per 100.0 g of water is cooled from 40 °C to 0 °C. What happens during cooling?
A KCl solution containing 42 g of KCl per 100.0 g of water is cooled from 60 °C to 0 °C. What happens during cooling?
Some laboratory procedures involving oxygen-sensitive reactants or products call for using water that has been boiled (and then cooled). Explain.
A person preparing a fish tank fills the tank with water that has been boiled (and then cooled). When the person puts fish into the tank, they die. Explain.
Scuba divers breathing air at increased pressure can suffer from nitrogen narcosis—a condition resembling drunkenness—when the partial pressure of nitrogen exceeds about 4 atm. What property of
Scuba divers breathing air at increased pressure can suffer from oxygen toxicity—too much oxygen in their bloodstream—when the partial pressure of oxygen exceeds about 1.4 atm.What happens to the
Calculate the mass of nitrogen dissolved at room temperature in an 80.0-L home aquarium. Assume a total pressure of 1.0 atm and a mole fraction for nitrogen of 0.78.
Use Henry’s law to determine the molar solubility of helium at a pressure of 1.0 atm and 25 °C.
An aqueous NaCl solution is made using 112 g of NaCl diluted to a total solution volume of 1.00 L. Calculate the molarity, molality, and mass percent of the solution.
An aqueous KNO3 solution is made using 72.5 g of KNO3 diluted to a total solution volume of 2.00 L. Calculate the molarity, molality, and mass percent of the solution.
To what volume should you dilute 50.0 mL of a 5.00 M KI solution so that 25.0 mL of the diluted solution contains 3.05 g of KI?
To what volume should you dilute 125 mL of an 8.00 M CuCl2 solution so that 50.0 mL of the diluted solution contains 4.67 g CuCl2?
Silver nitrate solutions are often used to plate silver onto other metals. What is the maximum amount of silver (in grams) that can be plated out of 4.8 L of an AgNO3 solution containing 3.4%Ag by
A dioxin-contaminated water source contains 0.085% dioxin by mass. How much dioxin is present in 2.5 L of this water?Assume a density of 1.00 g/mL.
A hard water sample contains 0.0085% Ca by mass (in the form of Ca2 + ions). How much water (in grams) contains 1.2 g of Ca?(1.2 g of Ca is the recommended daily allowance of calcium for adults
Lead is a toxic metal that affects the central nervous system.A Pb-contaminated water sample contains 0.0011% Pb by mass.How much of the water (in mL) contains 150 mg of Pb? (Assume a density of 1.0
You can purchase nitric acid in a concentrated form that is 70.3% HNO3 by mass and has a density of 1.41 g/mL. Describe exactly how you would prepare 1.15 L of 0.100 M HNO3 from the concentrated
You can purchase hydrochloric acid in a concentrated form that is 37.0% HCl by mass and that has a density of 1.20 g/mL.Describe exactly how to prepare 2.85 L of 0.500 M HCl from the concentrated
Describe how to prepare each solution from the dry solute and the solvent.a. 1.00 * 102 mL of 0.500 M KClb. 1.00 * 102 g of 0.500 m KClc. 1.00 * 102 g of 5.0% KCl solution by mass
Describe how to prepare each solution from the dry solute and the solvent.a. 125 mL of 0.100 M NaNO3b. 125 g of 0.100 m NaNO3c. 125 g of 1.0% NaNO3 solution by mass
A solution is prepared by dissolving 28.4 g of glucose (C6H12O6) in 355 g of water. The final volume of the solution is 378 mL. For this solution, calculate the concentration in each unit.a.
A solution is prepared by dissolving 20.2 mL of methanol (CH3OH) in 100.0 mL of water at 25 °C. The final volume of the solution is 118 mL. The densities of methanol and water at this temperature
Household hydrogen peroxide is an aqueous solution containing 3.0% hydrogen peroxide by mass. What is the molarity of this solution?
One brand of laundry bleach is an aqueous solution containing 4.55% sodium hypochlorite (NaOCl) by mass. What is the molarity of this solution?
An aqueous solution contains 36% HCl by mass. Calculate the molality and mole fraction of the solution.
An aqueous solution contains 5.0% NaCl by mass. Calculate the molality and mole fraction of the solution.
A beaker contains 100.0 mL of pure water. A second beaker contains 100.0 mL of seawater. The two beakers are left side by side on a lab bench for 1 week. At the end of the week, the liquid level in
Which solution has the highest vapor pressure?a. 20.0 g of glucose (C6H12O6) in 100.0 mL of waterb. 20.0 g of sucrose (C12H22O11) in 100.0 mL of waterc. 10.0 g of potassium acetate KC2H3O2 in 100.0
Calculate the vapor pressure of a solution containing 24.5 g of glycerin (C3H8O3) in 135 mL of water at 30.0 °C. The vapor pressure of pure water at this temperature is 31.8 torr. Assume that
A solution contains naphthalene (C10H8) dissolved in hexane (C6H14) at a concentration of 12.35% naphthalene by mass.Calculate the vapor pressure at 25 °C of hexane above the solution.The vapor
A solution contains 50.0 g of heptane (C7H16) and 50.0 g of octane (C8H18) at 25 °C. The vapor pressures of pure heptane and pure octane at 25 °C are 45.8 torr and 10.9 torr, respectively.Assuming
A solution contains a mixture of pentane and hexane at room temperature. The solution has a vapor pressure of 258 torr. Pure pentane and hexane have vapor pressures of 425 torr and 151 torr,
A solution contains 4.08 g of chloroform (CHCl3) and 9.29 g of acetone (CH3COCH3). The vapor pressures at 35 °C of pure chloroform and pure acetone are 295 torr and 332 torr, respectively.Assuming
A solution of methanol and water has a mole fraction of water of 0.312 and a total vapor pressure of 211 torr at 39.9 °C. The vapor pressures of pure methanol and pure water at this temperature are
A glucose solution contains 55.8 g of glucose (C6H12O6) in 455 g of water. Determine the freezing point and boiling point of the solution.
An ethylene glycol solution contains 21.2 g of ethylene glycol (C2H6O2) in 85.4 mL of water. Determine the freezing point and boiling point of the solution.
Calculate the freezing point and boiling point of a solution containing 10.0 g of naphthalene (C10H8) in 100.0 mL of benzene.Benzene has a density of 0.877 g/cm3.
Calculate the freezing point and boiling point of a solution containing 7.55 g of ethylene glycol (C2H6O2) in 85.7 mL of ethanol. Ethanol has a density of 0.789 g/cm3.
An aqueous solution containing 17.5 g of an unknown molecular (nonelectrolyte) compound in 100.0 g of water has a freezing point of -1.8 °C. Calculate the molar mass of the unknown compound.
An aqueous solution containing 35.9 g of an unknown molecular (nonelectrolyte) compound in 150.0 g of water has a freezing point of -1.3 °C. Calculate the molar mass of the unknown compound.
Calculate the osmotic pressure of a solution containing 24.6 g of glycerin (C3H8O3) in 250.0 mL of solution at 298 K.
What mass of sucrose (C12H22O11) would you combine with 5.00 * 102 g of water to make a solution with an osmotic pressure of 8.55 atm at 298 K?
A solution containing 27.55 mg of an unknown protein per 25.0 mL solution was found to have an osmotic pressure of 3.22 torr at 25 °C. What is the molar mass of the protein?
Calculate the osmotic pressure of a solution containing 18.75 mg of hemoglobin in 15.0 mL of solution at 25 °C. The molar mass of hemoglobin is 6.5 * 104 g/mol.
Calculate the freezing point and boiling point of each aqueous solution, assuming complete dissociation of the solute.a. 0.100 m K2Sb. 21.5 g of CuCl2 in 4.50 * 102 g waterc. 5.5% NaNO3 by mass (in
Calculate the freezing point and boiling point in each solution, assuming complete dissociation of the solute.a. 10.5 g FeCl3 in 1.50 * 102 g waterb. 3.5% KCl by mass (in water)c. 0.150 m MgF2
What mass of salt (NaCl) should you add to 1.00 L of water in an ice-cream maker to make a solution that freezes at -10.0 °C?Assume complete dissociation of the NaCl and density of 1.00 g/mL for
Determine the required concentration (in percent by mass) for an aqueous ethylene glycol (C2H6O2) solution to have a boiling point of 104.0 °C.
Use the van’t Hoff factors in Table 14.9 to calculate each colligative property:a. The melting point of a 0.100 m iron(III) chloride solution b. The osmotic pressure of a 0.085 M potassium sulfate
Using the van’t Hoff factors in Table 14.9, calculate the mass of solute required to make each aqueous solution:a. A sodium chloride solution containing 1.50 * 102 g of water that has a melting
A 1.2 m aqueous solution of an ionic compound with the formula MX2 has a boiling point of 101.4 °C. Calculate the van’t Hoff factor (i) for MX2 at this concentration.
A 0.95 m aqueous solution of an ionic compound with the formula MX has a freezing point of -3.0 °C. Calculate the van’t Hoff factor (i) for MX at this concentration.
A 0.100 M ionic solution has an osmotic pressure of 8.3 atm at 25 °C. Calculate the van’t Hoff factor (i) for this solution.
A solution contains 8.92 g of KBr in 500.0 mL of solution and has an osmotic pressure of 6.97 atm at 25 °C. Calculate the van’t Hoff factor (i) for KBr at this concentration.
Calculate the vapor pressure at 25 °C of an aqueous solution that is 5.50% NaCl by mass.
An aqueous CaCl2 solution has a vapor pressure of 81.6 mmHg at 50 °C. The vapor pressure of pure water at this temperature is 92.6 mmHg. What is the concentration of CaCl2 in mass percent?
The solubility of phenol in water at 25 °C is 87 g/L. The solubility of naphthol at the same temperature is only 0.74 g/L. Examine the structures of phenol and naphthol shown here and explain why
The solubility of carbon tetrachloride (CCl4) in water at 25 °C is 1.2 g/L. The solubility of chloroform (CHCl3) at the same temperature is 10.1 g/L. Why is chloroform almost ten times more soluble
Potassium perchlorate (KClO4) has a lattice energy of -599 kJ/mol and a heat of hydration of -548 kJ/mol. Find the heat of solution for potassium perchlorate and determine the temperature change that
Sodium hydroxide (NaOH) has a lattice energy of −887 kJ/mol and a heat of hydration of −932 kJ/mol. How much solution could be heated to boiling by the heat evolved by the dissolution of 25.0 g
A saturated solution forms when 0.0537 L of argon, at a pressure of 1.0 atm and a temperature of 25 °C, is dissolved in 1.0 L of water. Calculate the Henry’s law constant for argon.
A gas has a Henry’s law constant of 0.112 M/atm. What total volume of solution is needed to completely dissolve 1.65 L of the gas at a pressure of 725 torr and a temperature of 25 °C?
The Safe Drinking Water Act (SDWA) sets a limit for mercury—a toxin to the central nervous system—at 0.0020 ppm by mass.Water suppliers must periodically test their water to ensure that mercury
Water softeners often replace calcium ions in hard water with sodium ions. Since sodium compounds are soluble, the presence of sodium ions in water does not cause the white, scaly residues caused by
An aqueous solution contains 12.5% NaCl by mass. What mass of water (in grams) is contained in 2.5 L of the vapor above this solution at 55 °C? The vapor pressure of pure water at 55 °C is 118 torr.
The vapor above an aqueous solution contains 19.5 mg water per liter at 25 °C. Assuming ideal behavior, what is the concentration of the solute within the solution in mole percent?
What is the freezing point of an aqueous solution that boils at 106.5 °C?
What is the boiling point of an aqueous solution that has a vapor pressure of 20.5 torr at 25 °C?
An isotonic solution contains 0.90% NaCl mass to volume. Calculate the percent mass to volume for isotonic solutions containing each solute at 25 °C. Assume a van’t Hoff factor of 1.9 for all
A solution is prepared from 4.5701 g of magnesium chloride and 43.238 g of water. The vapor pressure of water above this solution is 0.3624 atm at 348.0 K. The vapor pressure of pure water at this
Magnesium citrate, Mg3(C6H5O7)2, belongs to a class of laxatives called hyperosmotics, which cause rapid emptying of the bowel.When a concentrated solution of magnesium citrate is consumed, it passes
When HNO2 is dissolved in water, it partially dissociates according to the equation HNO2 ⇌ H+ + NO2–. A solution is prepared that contains 7.050 g of HNO2 in 1.000 kg of water. Its freezing point
A solution of a nonvolatile solute in water has a boiling point of 375.3 K. Calculate the vapor pressure of water above this solution at 338 K. The vapor pressure of pure water at this temperature is
The density of a 0.438 M solution of potassium chromate (K2CrO4) at 298 K is 1.063 g/mL. Calculate the vapor pressure of water above the solution. The vapor pressure of pure water at this temperature
The vapor pressure of carbon tetrachloride, CCl4, is 0.354 atm, and the vapor pressure of chloroform, CHCl3, is 0.526 atm at 316 K. A solution is prepared from equal masses of these two compounds at
Distillation is a method of purification based on successive separations and recondensations of vapor above a solution. Use the result of the previous problem to calculate the mole fraction of
A solution of 49.0% H2SO4 by mass has a density of 1.39 g/cm3 at 293 K. A 25.0-cm3 sample of this solution is mixed with enough water to increase the volume of the solution to 99.8 cm3. Find the
Find the mass of urea (CH4N2O) needed to prepare 50.0 g of a solution in water in which the mole fraction of urea is 0.0770.
A solution contains 10.05 g of unknown compound dissolved in 50.0 mL of water. (Assume a density of 1.00 g/mL for water.)The freezing point of the solution is -3.16 °C. The mass percent composition
The osmotic pressure of a solution containing 2.10 g of an unknown compound dissolved in 175.0 mL of solution at 25 °C is 1.93 atm. The combustion of 24.02 g of the unknown compound produced 28.16 g
A 100.0-mL aqueous sodium chloride solution is 13.5% NaCl by mass and has a density of 1.12 g/mL. What would you add (solute or solvent), and what mass of it, to make the boiling point of the
A 50.0-mL solution is initially 1.55% MgCl2 by mass and has a density of 1.05 g/mL. What is the freezing point of the solution after you add an additional 1.35 g MgCl2?
The small bubbles that form on the bottom of a water pot that is being heated (before boiling) are due to dissolved air coming out of solution. Use Henry’s law and the solubilities given to
The vapor above a mixture of pentane and hexane at room temperature contains 35.5% pentane by mass. What is the mass percent composition of the solution? Pure pentane and hexane have vapor pressures

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