8. At 200℃, PCl5 dissociates as follows:6167c05eed38a.jpg It was found that the equilibrium vapors are 62 times as heavy as hydrogen. The percentage dissociation of PCl5 at 200℃ is
(A) 34.1%,
(B) 68.1%,
(C) 40.5%,
(D) 70.3%,
(E) 50.6%.

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統計： A(0), B(2), C(0), D(2), E(0) #2789558