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Boiling point fo chloroform was raised b...

Boiling point fo chloroform was raised by `0.323K`,when`0.5143g` of anthrance was dissolved in `35g`of chloroform .Molecular mass of anthracene is
`(K_(b)forCHCl_(3)=3.9 "K.kg mol"^(-1))`

A

`79.42g//mol`

B

`132.32g//mol`

C

`177.42g//mol`

D

`242.32g//mol`

Text Solution

Verified by Experts

The correct Answer is:
C
Here: `DeltaT_(b)=0.323K`
`w=0.1543g` weight of anthrance,
`W=35g` weight of chloroform
`K_(b)`=Molal elevation constant `(3.9K.kg//mol)`
`m=(K_(b)xxwxx1000)/(WxxDeltaT_(b))=(3.9xx0.5143xx1000)/(0.323xx35)`
`=177.42 g//mol`
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