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To an evacuated vessel with movable piston under external pressure of 1 atm, 0.1 mol of He and 1.0 mol of an unknown compound (vapour pressure 0.68 atm. at 0 ° C ) are introduced. Considering the ideal gas behaviour, the total volume (in litre) of the gases at 0 ° C is close to

Correct answer

7

Step-by-step solution

P H e = 1 - 0.68 = 0.32 a t m , n = 0.1 V = n R T P = 0.1 × 0.0821 × 273 0.32 = 7

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