Answer to Question #76332 in Physical Chemistry for Devlin

Question

For the reaction system N2(g) + 3H2(g) ⇌ 2NH3(g) at equilibrium, ΔH is -92 kJ. In order to both shift the equilibrium and increase the yield of ammonia, we should

1. increase the temperature

2. decrease the temperature

3. increase the pressure

4. decrease the pressure


A) 1 only
B) 2 only
C) 1 and 3 only
D) 2 and 3 only
E) 1 and 4 only

Answer 1

Solution:
It is necessary to use high pressure, because on the right there are less moles of gas.
It is necessary to use a low temperature, because the reaction is exothermic.
So correct answer is D) 2 and 3 only.
Answer: D) 2 and 3 only.