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A x molal solution of a compound in benz...

A `x` molal solution of a compound in benzene has mole fraction of solute equals to 0.2. The value of `x` is

A

1.4

B

3.2

C

1.4

D

2

Text Solution

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The correct Answer is:
B
`X_(2) =0.2 :. X_(1) = 0.8`
`m=(1000x_(2))/(x_(1) xx M_(1))=(1000 xx 0.2)/(0.8 xx 78)=3.2`
`("Where" M_(1) rarr "M,M of solvent i.e. Benzene" = 78)`
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