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The unit of freezing point depression co...

The unit of freezing point depression constant is

A

`K mol^(-1)`

B

`K kg^(-1) mol^(-1)`

C

`K kg mol^(-1)`

D

`K kg^(-1)`

Text Solution

Verified by Experts

The correct Answer is:
C
`DeltaT_f=K_f xx m`
`K_f = (DeltaT_f)/m = K/(mol kg^(-1))=kg mol^(-1)`
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What is the other name for freezing point depression constant or molal depression constant ?

The freezing point depression constant of benzene is 5.12 K kg mol^(-1) . The freezing point depression for the solution of molality 0.078m containing a non-electrolyte solute in benzene is

Knowledge Check

  • The freezing point depression constant (K_(f)) of benzene is 5.12 K kg mol^(-1) . The freezing point depression for the solution of molality 0.078 m containing a non-electrolyte solute in benzene is (rounded off upto two decimal places)

    A
    0.20 K
    B
    0.80 K
    C
    0.40 K
    D
    0.60 K

  • The freezing point depression constant (K_(f)) of enzene is 5.12 K kg mol^(-1) .The freezing point depression for the solution of molality 0.078 m containing a non - electrolyte solute in benzene is ( rounded off upto two decimal places ):

    A
    `0.80` K
    B
    `0.40` K
    C
    `0.60` K
    D
    `0.20` K

  • Molal freezing point depression constant (K_(f)) may be calculated from the following thermodynamically derived equation

    A
    `K_(f)=(RT_(f)^(2) DeltaH_(fus))/1000`
    B
    `K_(f)=(RT_(f))/(1000 DeltaH_(fus))`
    C
    `K_(f)=(RT_(f)^(2))/(1000 L_(fus))`
    D
    `K_(f)=T_(b)^(2)/(1000 L_(vap))`

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    A 0.561 m solution of an unknown elecrolyte depresses the freezing point of water by 2.93^(@)C . What is van't Hoff factor for the electrooyte ? The freezing point depression constant (K_(f)) for water is 1.86 kg mol^(-1) .

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