For PCl5(g) PCl3(g) + Cl2(g) the calculated vapour density of undissociated PCl5 is 104.25. If the compound is 25\% dissociated, the vapour density of the equilibrium mixture is

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For $PCl X_{5} (g) PCl X_{3} (g) + Cl X_{2} (g)$ the calculated vapour density of undissociated $PCl X_{5}$ is $104.25$ . If the compound is 25\% dissociated, the vapour density of the equilibrium mixture is

d = D / (1 + α) = 104.25/1.25 = 83.4

. Multiplying by

1 + α

or using

1 - α

are the usual slips.