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The freezing point depression constant f...

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

A

`0.381`

B

2.05

C

2.63

D

3.11

Text Solution

Verified by Experts

The correct Answer is:
C
Using, `DeltaT_(f)=ixxK_(f)xxm`
`i=(DeltaT_(f)xxW_(A))/(K_(f)xxn_(B)xx1000)=(3.82xx45)/(1.86xx((5)/(142))xx1000)=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) .

The freezing point depression constant for water is 1.86^(@)Cm^(-1) . If 5.00g NaSO_(4) is dissolved 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) .

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)

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