# 2.19    A solution containing of non-volatile solute exactly in of water has a vapour pressure of   at Further, of water is then added to the solution and the new vapour pressure becomes at Calculate               (ii) vapour pressure of water at 298 K.

In the previous part we have calculated the value of molar mass the Raoul's law equation.

Putting M = 23 u in the above equation we get,

or

Thus vapour pressure of water = 3.53 kPa.

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