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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

0.381

B

2.05

C

2.63

D

3.11

Text Solution

Verified by Experts

The correct Answer is:
C
`DeltaT=ixxK_(f)xx(w_(B)xx1000)/(m_(B)xxw_(A))`
`3.82=ixx1.86xx(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) .

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) .

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