Chemical EquilibriumHard

Question

At 200°C, PCl5 dissociates as PCl5(g) $\rightleftharpoons$PCl3(g) + Cl2(g). It was found that the equilibrium vapours are 62 times as heavy as hydrogen. The percentage dissociation of PCl5 at 200°C is

Options

A.34.1%
B.70.3%
C.40.5%
D.68.1%

Solution

$\alpha = \frac{M_{0} - M}{(n - 1).M} = \frac{208.5 - 124}{(2 - 1) \times 124} = 0.681$

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