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A solution containing 30g of non-volatil...

A solution containing 30g of non-volatile solute exactly in 90g of water has a vapour pressure of `2.8" kP"_(a)` at 298 K. Further 18g of water is then added to the solution and the new vapur pressure becomes `2.9" kP"_(a)` at 298 K. Calculate (i) The moar mass of the solute and (ii) Vapour pressure of water at 298 K.

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