A solution containing 10 g per dm3 of urea (molecular mass = 60) is isotonic with a 5% solution of a non–volatile solute. The molecular mass of this non–volatile solute is
300 g mol–1
350 g mol–1
200 g mol–1
250 g mol–1
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The vapour pressure of pure water at 20°C is 17.5 mm Hg. If 18 g of glucose (C6H12O6) is added to 178.2 g of water at 20°C,the vapour pressure of resulting solution will be