1. Consider the reversible reaction: 2 NaHSO 3 (s)  Na 2 SO 3 (s) + H 2 O(g) + SO 2 (g) ΔH > 0  What will be the mass action expression for this reaction?

2. Consider the reversible reaction: 2 NaHSO 3 (s)  Na 2 SO 3 (s) + H 2 O(g) + SO 2 (g) ΔH > 0  What will be the mass action expression for this reaction?  How will the position of equilibrium be affected by the following changes?  Adding sulfur dioxide gas to the reaction vessel? Provide a “rate changes” explanation.

3. Consider the reversible reaction: 2 NaHSO 3 (s)  Na 2 SO 3 (s) + H 2 O(g) + SO 2 (g) ΔH > 0  What will be the mass action expression for this reaction?  How will the position of equilibrium be affected by the following changes?  Adding sulfur dioxide gas to the reaction vessel? Provide a “rate changes” explanation.  Removing some solid sodium sulfite from the reaction vessel? Provide a “le Chatelier” explanation.

4. Consider the reversible reaction: 2 NaHSO 3 (s)  Na 2 SO 3 (s) + H 2 O(g) + SO 2 (g) ΔH > 0  What will be the mass action expression for this reaction?  How will the position of equilibrium be affected by the following changes?  Adding sulfur dioxide gas to the reaction vessel? Provide a “rate changes” explanation.  Removing some solid sodium sulfite from the reaction vessel? Provide a “le Chatelier” explanation.  Removing water vapor by adding an inert hygroscopic solid? Provide a “mathematical” explanation.

5. Consider the reversible reaction: 2 NaHSO 3 (s)  Na 2 SO 3 (s) + H 2 O(g) + SO 2 (g) ΔH > 0  What will be the mass action expression for this reaction?  How will the position of equilibrium be affected by the following changes?  Adding sulfur dioxide gas to the reaction vessel? Provide a “rate changes” explanation.  Removing some solid sodium sulfite from the reaction vessel? Provide a “le Chatelier” explanation.  Removing water vapor by adding an inert hygroscopic solid? Provide a “mathematical” explanation.  Increasing the volume. Provide a “le Chatelier” explanation… then confirm with a “mathematical” explanation.

6. Consider the reversible reaction: 2 NaHSO 3 (s)  Na 2 SO 3 (s) + H 2 O(g) + SO 2 (g) ΔH > 0  What will be the mass action expression for this reaction?  How will the position of equilibrium be affected by the following changes?  Adding sulfur dioxide gas to the reaction vessel? Provide a “rate changes” explanation.  Removing some solid sodium sulfite from the reaction vessel? Provide a “le Chatelier” explanation.  Removing water vapor by adding an inert hygroscopic solid? Provide a “mathematical” explanation.  Increasing the volume. Provide a “le Chatelier” explanation… then confirm with a “mathematical” explanation.  Heating the reaction vessel? (any explanation)

7. A student was studying the following reaction: SO 2 Cl 2 (g)  SO 2 (g) + Cl 2 (g). The value of K p for the sys­tem is 12.5 when the temperature is 565 K. A reactor vessel was filled with enough SO 2 Cl 2 (g) to give it a pressure of 2.275 atm at 565 K. The system was left undisturbed so it could come to equilibrium. Calculate the total pressure, in atmospheres, at equilibrium.

8. Maybe change this one… the cube root is yucky… but works. At 200.0˚C, K c = 1.4 x 10 -10 for the following reaction: N 2 O(g) + NO 2 (g)  3 NO(g) A sample of 300 mL of NO(g) measured at 800 torr and 25˚C is placed in a 4.00 L container. The temperature is raised to 200.0˚C and the system is allowed to reach equilibrium. What will be the molar concentration of NO at equilibrium? What will be its partial pressure?