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JEE Main Chemistry question

ChemistryStates of Matter (Gaseous & Liquid State)JEE Main

To an evacuated empty vessel which has a movable piston under external pressure of 1 atm, 0.20 mol of He and 1.00 mol of an unknown compound (vapour pressure 0.70 atm at 300 K) are introduced. Assuming ideal gas behaviour, the total volume of the gases at 300 K is L.

Answer: 16.42

Solution

Since the piston maintains total pressure equal to the external pressure of 1 atm, and the compound's vapour exerts its constant vapour pressure of 0.70 atm, the partial pressure of He is $1 -

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Question ID VK-134610