MEDIUMMCQ SINGLEJEE Advanced ChemistryPhysical ChemistrySolutionsRelative lowering of vapour pressure
Vapour pressure of a pure liquid X is 2 atm at 300 K. It is lowered to 1 atm on dissolving 1g of Y in 20g of liquid X. If molar mass of X is 200, what is the molar mass of Y?
A.20✓ Correct
B.50
C.100
D.200
Explanation
0 2 1 x x P at m P at m 1 20 200 / ? Y X X Y W g W g M g mole M 0 0 2 1 1 200 2 .20 1 200 200 2 2 20 20 20 / X X Y X X Y X Y Y Y Y P P W M P M W M M M M g mole x x
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