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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

79.42 g/mol

B

132.32 g/mol

C

177.42 g/mol

D

242.32 g/mol

Text Solution

Verified by Experts

The correct Answer is:
C
Here : `DeltaT_(b)=0.323K`
w = 0.5143g weight of Anthracene.
W = 35g weight of Chloroform
`K_(b)` = Molal elevation constant (3.9 K - Kg/mol)
`m=(K_(b)xxwxx1000)/(WxxDeltaT_(b))=(3.9xx0.5143xx1000)/(0.323xx35)`
= 177.42g/mol.
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