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Chemistry Question on Vapour Pressure of Liquid Solutions

The vapour pressure of pure benzene at a certain temperature is 0.850 bar. A non- volatile, non-electrolyte solid weighing 1.0 g when added to 39.0 g of benzene (molar mass 78 gmol−1g mol^{-1}), vapour pressure of the solution is reduced to 0.845 bar. What is the molar mass of the solid substance?

A

340 gmol−1g mol^{-1}

B

170 gmol−1g mol^{-1}

C

240 gmol−1g mol^{-1}

D

270 gmol−1g mol^{-1}

E

370 gmol−1g mol^{-1}

Answer

270 gmol−1g mol^{-1}

Explanation

Solution

The correct option is (D) : 270 gmol−1g mol^{-1}