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Predict the effect of decreasing the temperature on the
Chapter 17, Problem 60P(choose chapter or problem)
Problem 60P
Predict the effect of decreasing the temperature on the amounts of reactants in the following reactions:
(a) C2H2(g) + H2O(g) ⇌ CH3CHO(g) ΔH°rxn = −151 kJ
(b) CH3CH2OH(l) + O2(g) ⇌ CH3CO2H(l) + H2O(g) ΔH°rxn = −451 k J]
(c) 2C2H4(g) + O2(g) ⇌ 2CH3CHO(g) (exothermic)
(d) N2O4(g) ⇌ 2NO2(g) (endothermic)
Questions & Answers
QUESTION:
Problem 60P
Predict the effect of decreasing the temperature on the amounts of reactants in the following reactions:
(a) C2H2(g) + H2O(g) ⇌ CH3CHO(g) ΔH°rxn = −151 kJ
(b) CH3CH2OH(l) + O2(g) ⇌ CH3CO2H(l) + H2O(g) ΔH°rxn = −451 k J]
(c) 2C2H4(g) + O2(g) ⇌ 2CH3CHO(g) (exothermic)
(d) N2O4(g) ⇌ 2NO2(g) (endothermic)
ANSWER:
Solution 60P:
Here, we are going to predict the effect of decreasing the temperature on the amounts of reactant 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.