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The vapour pressure of pure benzene at a...

The vapour pressure of pure benzene at a certain temperature is 0.850 bar. A non-volatile, non-electrolyte solid weighing 0.5 g when added to 39.0 g of benzene (molar mass 78 g `mol^-1`), vapour pressure of the solution, then, is 0.845 bar. What is the moler mass of the solid substance ?

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