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The freezing point depression constant f...

The freezing point depression constant for water is `-1.86^(@)Cm^(-1).`if `5.00g Na_(2)SO_(4)`is dissolved in `45.0gH_(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`
`3.82xxi=1.86xx(5xx1000)/(142xx45)`
`i=2.63`
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The freezing point depression constant for water is 1.86^(@)C m^(-1) . If 5.00g Na_(2)SO_(4) is dissolved in 45.0 H_(2)O , the freezing point is charged by -3.82^(@)C . Calculate the van't Hoff factor for Na_(2)SO_(4) .

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