What happens to the concentration of both components in the system as volume decreases? N2O4 (g) 2NO2 (g) both increase NO2 less; N2O4 greater NO2 greater; N2O4 less both decrease

According to Le Chatelier's principle when a system at equilibrium is subjected to changes in temperature, pressure, volume then the equilibrium will shift in a direction to counteract the induced change.

The given equilibrium is:

N2O4 (g) ↔ 2NO2 (g)

Since Volume (V) is inversely related to the pressure (P), a decrease in V will cause an increase in P. Based on Le Chatelier's principle, the equilibrium will now shift to the direction of lower pressure i. e. towards the reactants (since the # moles of reactants is less than the products). As a result concentration of N2O4 will increase and that of NO2 will decrease.

Ans: B

NO2 less, N2O4 greater