The vapour pressure of two liquid P and Q are 80 torr and 60 torr respectively. The total vapour pressure obtained by mixing 3 mole of P and 2 mole of Q would be

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68 torr

20 torr

140 torr

72 torr

answer is D.

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Detailed Solution

The total vapour pressure of solution, PM=80×35+60×25 =48+24=72 torr

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