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The vapour pressure of pure liquid solve...

The vapour pressure of pure liquid solvent `A` is `0.80 atm`. When a non-volatile substance `B` is added to the solvent, its vapour pressure drops to `0.60 atm`, the mole fraction of component `B` in the solution is

A

0.25

B

0.75

C

0.5

D

0.35

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A
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