For the manufacture of NO by the reaction N2(g) + O2(g) <-> 2NO(g), with ΔH positive, the forward reaction is favoured if:

the pressure is increased
the pressure is decreased
the temperature is increased
the temperature is decreased

Correct answer: the temperature is increased

Solution

Since the reaction is endothermic (ΔH positive), increasing temperature shifts equilibrium toward products; pressure has no effect because moles of gas are equal on both sides.

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