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The freezing point depression constant f...

The freezing point depression constant for water is `-1.86^(@)C m^(-1)`. If `5.00 g Na_(2)SO_(4)` is dissoloved in `45.0 g H_(2)O`, the freezing point is changed by `-3.82^(@)C`. Calculate the van't Hoff factor for `Na_(2)SO_(4)`.

A

`2.05`

B

`2.63`

C

`3.11`

D

`0.381`

Text Solution

Verified by Experts

The correct Answer is:
2
`K_(f)=-186^(@)cm^(-1)`
`DeltaT_(f)=ixxK_(f).m`
`3.82=ixx1.86xx(5xx1000)/(142xx45)`
`i=2.63`
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