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At 300 K , when a solute is aded to a...

At 300 K , when a solute is aded to a solvent ,its vapour pressure over mercury reduces from 50 mm to 45 mm . The value of mole fraction of solute wil be _____.

A

`0.005`

B

`0.010`

C

`0.100`

D

`0.900`

Text Solution

Verified by Experts

The correct Answer is:
C
Vapour pressure of solvent `P_(0)=50mm`
Vapour pressure of solution P = 45mm
Mole fraction of solute `=(P_(0)-P)/(P_(0))=(50-45)/(50)`
`=(5)/(50)=0.1`.
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