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The vapour pressure of benzene at 80C is lowered by 10 mm when 2.0 g of a non-volatile substance is dissolved in 78 g

The vapour pressure of benzene at 80C is lowered by 10 mm when 2.0 g of a non-volatile substance is dissolved in 78 g of benzene. The vapour pressure of pure benzene at 80C is 750 mm. The molar mass of the non-volatile substance is (a) 150 (b) 1050 (c) 1500 (d) 1550

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