Question

Does Le Chatelier's principle predict a change of equilibrium concentration for the following reaction if the gas mixture is compressed?
$N_2{O}_4\left(g\right)\rightleftharpoons 2{NO}_2\left(g\right)$

• A. Yes, backward reaction is favoured
• B. Yes, forward reaction is favoured
• C. No change
• D. No information

Answer 1

The correct option is A Yes, backward reaction is favoured

$N_2{O}_4\left(g\right)\rightleftharpoons 2N{O}_2\left(g\right)$

One mole of $N_2{O}_4$ gives $2$ moles of $N{O}_2$ gas. The pressure of the gas increases. Upon compressing the gaseous mixture, there is a change in an equilibrium concentration & backward reaction is favoured. This is according to Le Chatlier's Principle