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Question

The vapour pressure of pure benzene and at a certain temperature is 640mm Hg. A non-volatile, non-electrolyte solid weighing 2.175g is added to 39.0g of benzene. The vapour pressure of the solution is 600mm Hg.
What is the molecular weight of the solid substance?

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Solution

Given that

Po=640mmHg,PS=600mmHg

W2=2.175g,W1=39.0g

Mw1=78

PoPSPo=W2×Mw1Mw2×W1

640600640=2.175×78Mw2×39

Mw2=69.670

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