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The freezing point of a solution contain...

The freezing point of a solution containing 4.8 g of a compound in 60 g of benzene is 4.48. What is the molar mass of the compound ? ( `K_(f)=5.1 Km^(-1)`, freezing point of benzene `=5.5^(@)C` )

A

200

B

40

C

400

D

256

Text Solution

Verified by Experts

The correct Answer is:
C
`M_(B)=(k_(f)xx1000xxw_(B))/(w_(A) xx Delta T_(f))=(5.1xx1000xx4.8)/(60xx1.02)=400`
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