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

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