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How many grams of sucrose (molecular wei...

How many grams of sucrose (molecular weight 342) should be dissolved in `100 g` water in order to produce a solution with `105^(@)C` difference between the freezing point and the boiling point ? `(K_(b) =0.51^(@)C m^(-1) , (K_(f) =1.86^(@)C m^(-1))`

A

`34.2 g `

B

`72 g`

C

`342g`

D

`460 g`

Text Solution

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The correct Answer is:
B
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How many grams of sucrose (M. wt. = 342) should be dissolved in 100 g water in order to produce a solution with 105.0^(@)C difference between the freezing point and the boiling point ? (K_(f)=1.86^(@)C//m, K_(b)=0.51^(@)C//m)

The amount (in grams) of sucrose (mol.wt. = 342g) that should be dissolved in 100 g water in order to produce a solution with a 105.0^@C difference between the boiling point and freezing point is (Given that k_f=1.86Kkgmol^(-1) and k_b=0.52Kkgmol^(-1)" for water") Report your answer by rounding it up to to the nearest whole number.

Knowledge Check

  • How many grams of sucrose (Molecular weight = 342) should be dissolved in 100 g water to produce a solution with a 105^(@) difference between the freezing point and the boiling temperatures? [K_(l)= 1.86, K_(b) = 0.51]

    A
    34.2 g
    B
    72 g
    C
    342 g
    D
    460 g

  • How many moles of sucrose should be dissolved in 500 g of water so as to get a solution which has a difference of 104^(@)C between boiling point and freezing point ? ( K_(f) = 1.86 K kg mol^(-1) , K_(b) = 0.52 K kg mol^(-1) )

    A
    `1.68`
    B
    `1.492`
    C
    `8.40`
    D
    `0.840`

  • How many moles of sucrose should be dissolved in 500gms of water so as to get a solution which has a difference of 104^(@)C between boiling point and freezing point. (K_(f)=1.86 K Kg "mol"^(-1).K_(b)=0.52K Kg "mol"^(-1))

    A
    `1.68`
    B
    `3.36`
    C
    `8.40`
    D
    `0.840`

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    The boiling point of an aqueous solution is 100.18 .^(@)C . Find the freezing point of the solution . (Given : K_(b) = 0.52 K kg mol^(-1) ,K_(f) = 1.86 K kg mol^(-1))

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    The amount of urea to be dissolved in 500 cc of water (K_(f)=1.86) to produce a depresssion of 0.186^(@)C in the freezing point is :

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