Equilibrium
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Equilibrium
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16 Questions

1. Which of the following best accounts for the fact that, at the same altitude, the partial pressure of water vapor in the atmosphere can increase significantly with increasing temperature, but the partial pressures of N2, O2, Ar, and CO2 stay relatively constant?
2. Consider a closed, adiabatic system consisting of a mixture of liquid and solid substance Z at equilibrium at its melting point. Which of the following statements is true regarding the system?
3. At 500 K, the Keq for the reaction above is 2.5 × 1010. What is the value of Keq for the reverse reaction at 500 K?
4. Which of the following stresses when applied to the reaction above will result in an increased amount of MgO(s)? I. Remove Mg(s) II. Increase the pressure (decrease the volume) III. Add O2(g)
5. A soluble compound XY3 dissociates in water according to the equation above. If, in a 0.06-m solution of the compound, 30.0 percent of XY3 dissociates, which of the following is closest to the number of moles of particles of solute per 1.0 kg of water?
6. A closed rigid container contains distilled water and H2(g) at equilibrium. Which of the following actions would increase the concentration of H2(g) in the water? I. Decreasing the temperature of the water II. Vigorous shaking III. Injecting more H2(g) into the container
7. The figure above shows two completely sealed containers, a 10-mL tube, and a 1,000-mL bowl, each filled to a fraction of its volume with methanol. In a laboratory at 1 atm and 25°C, the vapor pressure of the methanol is
8. A solution contains 0.2 M Ba2+ and 0.2 M Ca2+. Which of the following CrO42– concentrations will precipitate as much Ba2+ as possible without precipitating any CaCrO4? (The Ksp of BaCrO4 = ~1 × 10-10 and the Ksp of CaCrO4 = ~7 × 10−4.)
9. In which of the following reactions at equilibrium will there be no change in response to a change in the volume of the reaction vessel? (Assume constant temperature.)
10. A solution contains 0.2 M Ba2+ and 0.2 M Ca2+. Which of the following CrO42– concentrations will precipitate as much Ba2+ as possible without precipitating any CaCrO4? (The Ksp of BaCrO4 = ~1 × 10-10 and the Ksp of CaCrO4 = ~7 × 10−4.)
11. A soluble compound XY3 dissociates in water according to the equation above. If, in a 0.06-m solution of the compound, 30.0 percent of XY3 dissociates, which of the following is closest to the number of moles of particles of solute per 1.0 kg of water?
12. At 500 K, the Keq for the reaction above is 2.5 × 1010. What is the value of Keq for the reverse reaction at 500 K?
13. What is the molar solubility of BaSO4(s) in water? (The Ksp for BaSO4(s) is 1.1 × 10−10.)
14. The figure above shows two completely sealed containers, a 10-mL tube, and a 1,000-mL bowl, each filled to a fraction of its volume with methanol. In a laboratory at 1 atm and 25°C, the vapor pressure of the methanol is
15. What is the molar solubility of BaSO4(s) in water? (The Ksp for BaSO4(s) is 1.1 × 10−10.)
16. A saturated solution of metal hydroxide M(OH)2, has a pH of 10.0 at 25°C. What is the Ksp value for M(OH)2?

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