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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. Anon- volatile non electrolyte solid weighing 0.5 g when added to 39.0 g of benzene (mol mass 78 g `mol^-1`) the vapour pressure of solution was reduced to 0.845 bar. Calculate the molar mass of the solid substance.

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