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Predict the effect of increasing the temperature on the
Chapter 17, Problem 59P(choose chapter or problem)
Problem 59P
Predict the effect of increasing the temperature on the amounts of products in the following reactions:
(a) CO(g) + 2H2(g) ⇌ CH3OH(g) ΔH°rxn = −90.7 kJ
(b) C(s) + H2O(g) ⇌ CO(g) + H2(g) ΔH°rxn = 131 kJ
(c) 2NO2(g) 2NO(g) + O2(g) (endothermic)
(d) 2C(s) + O2(g) ⇌ 2CO(g) (exothermic)
Questions & Answers
QUESTION:
Problem 59P
Predict the effect of increasing the temperature on the amounts of products in the following reactions:
(a) CO(g) + 2H2(g) ⇌ CH3OH(g) ΔH°rxn = −90.7 kJ
(b) C(s) + H2O(g) ⇌ CO(g) + H2(g) ΔH°rxn = 131 kJ
(c) 2NO2(g) 2NO(g) + O2(g) (endothermic)
(d) 2C(s) + O2(g) ⇌ 2CO(g) (exothermic)
ANSWER:
Solution 59P:
Here, we are going to predict the effect of increasing the temperature on the amounts of products in the following reactions.
Step 1:
According to Le Chatelier's principle “only temperature changes alter the equilibrium constant.”
- A temperature rise will increase the equilibrium constant for a system with a positive H°rxn.
- A temperature rise will decrease the equilibrium constant for a system with a negative H°rxn.