Higher yield of NO inN (g) O 2NO(g) 2 2 +  can be obtained at[∆H of the reaction = + 180.7 kJ mol–1]A. higher temperatureB. lower temperatureC. higher concentration of N2D. higher concentration of O2Choose the correct answer from the options givenbelow:

Answer

Thermodynamic Behavior and Equilibrium Shift in NO Formation

The reaction is strongly endothermic (ΔH = +180.7 kJ·mol⁻¹), so raising the temperature shifts equilibrium toward NO.

Le Chatelier’s Principle also predicts that increasing the concentration of either reactant (N₂ or O₂) drives the equilibrium forward to re-establish balance.

Lower temperature would favor the exothermic reverse step, resulting in less formation of NO.