Q.

2 mole of PCl5 is heated in a one litre vessel. If PCl5 dissociates to the extent of 80%, the equilibrium constant for the dissociation of PCl5 is

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answer is 2.

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Detailed Solution

Vvessel = 1Degree of decomposition, α = For every 1 mole of PCl5 taken 0.8 moles decomposes.For every 2 mole of PCl5 taken 1.6 moles decomposes.1 mole of PCl5 decomposes to give 1 mole of PCl3 and 1 mole of Cl21.6 mole of PCl5 decomposes to give 1.6 mole of PCl3 and 1.6 mole of Cl2

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