Download Special Topics in Biochemistry and Its Applications - Worksheet | CHEM 122 and more Study notes Chemistry in PDF only on Docsity! Chapter 9 - Lecture Worksheet 5 1. Consider the following system at equilibrium where ΔHo = -111 kJ, and Kc = 0.159, at 723 K: N2(g) + 3 H2(g) <-----> 2 NH3 (g) If the volume of the equilibrium system is suddenly decreased at constant temperature: A. The value of Kc 1. Increases 2. Decreases 3. Remains the same B. The value of Q 1. Is greater than K 2. Is equal to K 3. Is less than K C. The reaction must: 1. Run in the forward direction to restablish equilibrium. 2. Run in the reverse direction to restablish equilibrium. 3. Remain the same. Already at equilibrium. D. The number of moles of H2 will: 1. Increase 2. Decrease 3. Remain the same. 2. Kp for the following reaction is 0.16 at 250C. The enthalpy change for the reaction at standard conditions is 16.1 kJ. Predict the effect of the following changes on the direction the reaction must move in order to reestablish equilibrium: PRS Answers: 1. Left 2. Right 3. No change 2 NOBr(g) <------> 2 NO(g) + Br2(g) A. Add more Br2(g) B. Remove some NOBr(g) C. Decrease the temperature D. Increase the volume of the container. 3. Consider the following system at equilibrium where ΔHo = -111 kJ, and Kc = 0.159, at 723 K: N2(g) + 3 H2(g) <-----> 2 NH3 (g) If the TEMPERATURE of the equilibrium system is suddenly decreased: A. The value of Kc 1. Increases 2. Decreases 3. Remains the same B. The value of Q 1. Is greater than K 2. Is equal to K 3. Is less than K C. The reaction must: 1. Run in the forward direction to restablish equilibrium. 2. Run in the reverse direction to restablish equilibrium. 3. Remain the same. Already at equilibrium. D. The concentration of H2 will: 1. Increase 2. Decrease 3. Remain the same 4. If you want to MAXIMIZE the production of ammonia you should: 1. Run at high temperature 2. Run at low temperature 3. Run at high pressure 4. Run at low pressure 5. Add H2 and N2 6. Remove H2 and N2 7. Add NH3 8. Remove NH3
