The vapour pressure of a solvent A is 0.80 atm When a non-volatile substance B is added to this solvent its vapour pressure drops to 0.6 atm. What is mole fraction of B in solution [MP PMT 2000, 01]

The vapour pressure of a solvent A is 0.80 atm When a non-volatile s

1.	The vapour pressure of a solvent A is 0.80 atm When a non-volatile substance B is added to this solvent its vapour pressure drops to 0.6 atm. What is mole fraction of B in solution [MP PMT 2000, 01]
A.	0.25
B.	0.50
C.	0.75
D.	0.90
Answer» B. 0.50

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The vapour pressure of a solvent A is 0.80 atm When a non-volatile substance B is added to this solvent its vapour pressure drops to 0.6 atm. What is mole fraction of B in solution [MP PMT 2000, 01]

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