In which of the following reactions,increase | vedclass

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Question

(C) For the number of moles at equilibrium to remain unaffected by a change in volume at constant temperature,the reaction must have $\Delta n_g = 0$

Vedclass · Accepted Answer

$H_{2(g)} + I_{2(g)} \rightleftharpoons 2HI_{(g)}$

Vedclass · Answer

(C) For the number of moles at equilibrium to remain unaffected by a change in volume at constant temperature,the reaction must have $\Delta n_g = 0$ (where $\Delta n_g$ is the change in the number of moles of gaseous species). Calculating $\Delta n_g$ for the given reactions: $A$) $2NH_{3(g)} ightleftharpoons N_{2(g)} + 3H_{2(g)}$; $\Delta n_g = (1 + 3) - 2 = 2 
eq 0$. $B$) $C_{(s)} + \frac{1}{2} O_{2(g)} ightleftharpoons CO_{(g)}$; $\Delta n_g = 1 - 0.5 = 0.5 
eq 0$. $C$) $H_{2(g)} + I_{2(g)} ightleftharpoons 2HI_{(g)}$; $\Delta n_g = 2 - (1 + 1) = 0$. Since reaction $C$ has $\Delta n_g = 0$,the equilibrium composition remains unaffected by a change in volume. Thus,the correct option is $C$.

In which of the following reactions,increase in the volume at constant temperature does not affect the number of moles at equilibrium?

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