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Q. A solution of $0.5\,g$ of a solute (molar mass $=150\,g\,mol^{- 1}$ ) in $50\,g$ of a solvent yields a boiling point elevation of $0.40K$ . Another solution of $0.60g$ of an unknown solute in the same mass of solvent exhibits a boiling point elevation of $0.8\,K$ . The molar mass of unknown solute is :

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