1.

12g of urea is dissolved in 1 litre of water a 68.4g of sucrose is dissolved in 1 litre of water The lowering of vapour pressure of first case is

Answer»

equal to second
greater than second
less than second
DOUBLE that of second

SOLUTION :12g UREA = 12/60 mol = 0.2 mol,
86.4g sucrose =68.4/342=0.2 mol.
As mole fraction of SOLUTE is same. Hence, lowering of V.P. is same .


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