Question

What happens to the reaction 2 N O 2 in equilibrium with N 2 O 4 plus 57.3 kilojoules when the temperature of the reaction is increased?

A. the reaction stops

B. more reactant forms

C. no change occurs

D. more product forms

Answer 1

The reaction is
\[2NO _{2} <=> N _{2}O _{4}\]
This reaction is exothermic in the forward reaction (produces N2O4), and endothermic in the reverse reaction (produces NO2). This is because N2O4 is more stable than NO2 (the bonds in the N2O4 are stronger than the bonds in the NO2).

Apply Le Chatelier's Principle : The equilibrium always shifts in the direction which nullify the outside effects.