Problem: Consider the following reaction at equilibrium in a closed container.4 NH3 (g) + 3 O2(g) ⇌ 2 N2(g) + 6 H2O(g) ΔH = +64.5 kJ/molDecreasing the volume of the reaction vessel will __________ the NH3 partial pressure.A) increaseB) decrease C) not change

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We’re being asked to determine what will happen to the NH3 partial pressure when the volume is decreased. 


4 NH3 (g) + 3 O2(g) ⇌ 2 N2(g) + 6 H2O(g)   ΔH = +64.5 kJ/mol


According to Le Chatelier’s Principle, if a system (chemical reaction) is at equilibrium and we disturb it, then the system will readjust to maintain its equilibrium state.


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Problem Details

Consider the following reaction at equilibrium in a closed container.

4 NH3 (g) + 3 O2(g) ⇌ 2 N2(g) + 6 H2O(g) ΔH = +64.5 kJ/mol

Decreasing the volume of the reaction vessel will __________ the NH3 partial pressure.

A) increase

B) decrease 

C) not change

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