# 2.17   The vapour pressure of water is at   Calculate vapour pressure of 1 molal solution of a non-volatile solute in it.

It is asked the vapour pressure of 1 molal solution which means 1 mol of solute in 1000 g H2O.

Moles in 1000g of water = 55.55 mol.         (Since the molecular weight of H2O is 18)

Mole fraction of solute :

Applying the equation :

or

or

Thus the vapour pressure of the solution is 12.083 KPa

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