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In an evaculated closed isolated chamber...

In an evaculated closed isolated chamber at `250^@C` , 0.02 mole `PCl_5` and 0.1 mole `Cl_2` are mixed. `(PCl_5 ltimplies PCl_3+Cl_2)`.At equilibrium density of mixture was 2.48 g/L and pressure was 1 atm. The number of total moles of equilibrium will be approximately :

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