A solution containing \(30 \mathrm{gm}\) of non - volatile solute exactly in \(90 \mathrm{gm}\) ...

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A solution containing \(30 \mathrm{gm}\) of non - volatile solute exactly in \(90 \mathrm{gm}\) of water has a vapour pressure of \(2.8 \mathrm{kPa}\) at \(298 \mathrm{~K}\). Further, \(18 \mathrm{gm}\) of water is then added to the solution and the new vapour pressure becomes \(2.9 \mathrm{kPa}\) at \(298 \mathrm{~K}\). Calculate: (i) molar mass of the solute (ii) vapour pressure of water at \(298 \mathrm{~K}\).
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