For the reaction P C l 5 ( g ) ⇋ P C l 3 ( g ) + C l 2 ( g ) , the forward reaction at constant temperature is favored by – Options: A . &nbspIntroducing an inert gas at constant volume B . &nbspIntroducing chlorine gas at constant volume C . &nbspIntroducing an inert gas at constant pressure D . &nbspDecreasing the volume of container

For the reaction PCl5(g) ⇋ PCl3(g) + Cl2(g), the

Discussion Forum : Chemical Equilibrium

Question - For the reaction

P C l_{5} (g) ⇋ P C l_{3} (g) + C l_{2} (g),

the forward reaction at constant temperature is favored by –

Options:

A . Introducing an inert gas at constant volume

B . Introducing chlorine gas at constant volume

C . Introducing an inert gas at constant pressure

D . Decreasing the volume of container

Answer: Option C
:
C
a) Introducing an inert gas at constant volume does not change the partial pressure of gases. Hence it does not affect the equilibrium.
b) Introducing chlorine gas at constant volume will favor the backward reaction.
c) Introducing inert gas at constant pressure means, one has to increase the volume of the container given temperature is also not changing.

\begin{matrix} P V    m u s t i n c r e a s e = n    i n c r e a s i n g R T \end{matrix}

Increasing container volume will favor the forward reaction. Henceoption (c) is correct.
d) Decreasing the container volume will favor backward reaction.

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