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KEAM 2021 Physics and Chemistry Solved Paper

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Question : 104

Total: 120

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

340 g mol−1
170 g mol−1
240 g mol−1
270 g mol−1
370 g mol−1

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