For the industrial synthesis of nitric oxide via N2(g) + O2(g) ⇌ 2NO(g) (endothermic, ΔH > 0), the forward formation of NO is favoured by:

Increasing the pressure
Decreasing the pressure
Increasing the temperature
Decreasing the temperature

Correct answer: Increasing the temperature

Solution

Since moles of gas are equal on both sides, pressure changes do not shift the equilibrium. As the reaction is endothermic, raising the temperature shifts equilibrium toward NO.

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