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The fraction of phenol dimerised in ben...

The fraction of phenol dimerised in benzene if 20 g of phenol in 1 kg benzene exhibts a freezing point depression of 0.69 K.`( K_(f) "benzene "=5.12 (K-kg)/(mol))` ltbgt (MW phenol =94)

A

0.74

B

0.37

C

0.46

D

0.64

Text Solution

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The correct Answer is:
A
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What is the weight of 1 mole of a solute, 0.132g of which in 29.7g of benzene, gave a freezing-point depression of 0.108^(@)C ? ( K_(f) for benzene =5.12 )

Phenol associaes in bensen to a certain extent to from a dimer. A solution containing 2.0xx10^(-2) kg of phenol in 1.0 kg of benzene has a greezing point decreased by 0.69 K. What is the degree of association of phenol ? ( K_(f) for benzene=5.12 K kg mol^(-1) ).

Knowledge Check

  • The fraction of phenol dimerised in benzene if 20 g of phenol in 1 kg benzene exhibits a freezing point depression of 0.69K(K_(f) benzene =5.12),(Mw phenol=94).What is the value of Van't Hoff for (i) in this reaction ?

    A
    `0.63`
    B
    `0.37`
    C
    `0.46`
    D
    `064`

  • phenol associates in benzene to a certain extent in dimerisation reaction. A solution containing 0.02 kg of phenol in 1.0 kg of benzene has its freezing point depressed 0.69 k. [ K_(f)(_(6)H_(6)) =5.12 k "mol"^(-1) ]

    A
    0.63
    B
    0.73
    C
    0.83
    D
    0.93

  • An element X of atomic mass 25.0 exists as X)_(4) in benzene to the extent of 100% . When 10.30g of saturated solution of X in benzene is added to 20.0 g of benzene, the depression in freezing point of the resulting solution is 0.51 K. If K_(f) for benzene is "5.1 K kg mol"^(-1) , the solubility of X in 100 g of benzene will be

    A
    3.0 g
    B
    2.7 g
    C
    0.30 g
    D
    0.27 g

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    Phenol associates in benzene to certain extent to form a dimer. A solution containing 20 xx 10^(-3) kg of phenol in 1.0 kg of benzene hs its freezing point depressed by 0.69 K . Calculate the fraction of phenol that has dimerized. ( K_(f) for benzene is 5.12 K kg mol^(-1) ).

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