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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

`2.05`

B

`2.63`

C

`3.11`

D

`0.381`

Text Solution

Verified by Experts

The correct Answer is:
B
`K_(f) = -186 . ^(@)C mol^(-1)`
`DeltaT_(r ) = I xx K_(f) m `
`3.82 = I xx 1.86 xx (5 xx 1000)/(142 xx 45)`
i= 2.63
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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)

Knowledge Check

  • 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) .

    A
    `3.11`
    B
    `0.381`
    C
    `2.05`
    D
    `2.61`

  • The freezing point depression constant for water is -1.86cm^(-1) . If "5.00 g "Na_(2)SO_(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)

    A
    0.381
    B
    2.05
    C
    2.63
    D
    3.11

  • 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) .

    A
    `2.05`
    B
    `2.63`
    C
    `3.11`
    D
    `0.381`

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