Q.

The vapor pressure of benzene at a certain temperature is 640 mm of Hg. A non volatile and non electrolyte solid weighing 2.175 g is added to 39.08 g of benzene. If the vapor pressure of the solution is 600 mm of Hg, what is the molecular weight of solid substance?

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answer is 69.6.

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Detailed Solution

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P°-PSP°=weight of solute×molecular weight of benzenemolecular weight of solute×weight of benzene 640-600640=2.175×78molecular weight of solute×39.08 molecular weight of solute=69.60

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