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PCl5 dissociates as PCl5⇌PCl3+Cl2.When 0...

`PCl_5` dissociates as `PCl_5⇌PCl_3+Cl_2`.When 0.03 mol of `PCl_5` was brought to equilibrium at 500 K and 1.0 atmosphere the equilibrium volume was 2.09 L.The equilibrium constant for the reaction is ?

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`alpha = 0.67`
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