Q.

Mass of Urea (NH2CONH2) required to be dissolved in 1000 g of water in order to reduce the vapour pressure of water by 25%  is ________ g (Nearest integer)

Given : Molar mass of N, C, O and H are 14,12,16 and 1 g mol-1 respectively.

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answer is 1111.

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Detailed Solution

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RLVP=×

P0PP=× solute 

14=× solute 

Let mass of urea = x

14=x60x60+100018

 On solving x=100009=1111.112

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