Home
Class 12
CHEMISTRY
Calculate the mass of ascorbic acid (Mol...

Calculate the mass of ascorbic acid (Molar mass = 176 g `mol^(-1)`) to be dissolved in 75 g of acetic acid, to lower its freezing point by `1.5^(@)C. [K_(f)=3.9"K kg mol"^(-1)]`

Text Solution

Verified by Experts

Apply the relation
`M_(2)=(K_(f)xx w_(2) xx 1000)/(DeltaT_(f) xx w_(1))`
Given: `K_(f)=3.9"K kg mol"^(-1), M_(2)=176" g mol"^(-1), DeltaT_(f)=1.5""^(@)C, w_(1)=75g`
Substituting the values in the equation above, we have
`176" g mol"^(-1)=(3.9"K kg mol"^(-1) xx w_(2) xx 1000)/(1.5K xx 75g)`
or `w_(2)=(176"g mol"^(-1)xx1.5K xx 75g)/(3.9"K kg mol"^(-1) xx 1000"g kg"^(-1))`
`=(176xx1.5xx75)/(3.9xx1000)=5.077g`
Promotional Banner

Topper's Solved these Questions

  • CBSE EXAMINATION PAPER 2020

    U-LIKE SERIES|Exercise SECTION D|6 Videos

  • CBSE EXAMINATION PAPER 2020

    U-LIKE SERIES|Exercise SECTION B|9 Videos

  • BIOMOLECULES

    U-LIKE SERIES|Exercise LONG ANSWER QUESTIONS - I|22 Videos

  • CBSE EXAMINATION PAPER 2020 (CODE No.56/4/1)

    U-LIKE SERIES|Exercise SECTION -D|3 Videos

Similar Questions

Explore conceptually related problems

Calculate the mass of ascorbic acid ( Vitamin C,C_(6)H_(8)O_(6)) to be dissolved in 75g of acetic acid to lower its melting poit by 1.5^(@)C. K_(f)=3.9 K kg mol ^(-1)

Calculating the mass of ascorbic acid (C_(6)H_(8)O_(6)) to be dissolved in 74 g of acetic acid to lower its melting point by 1.5^(circ)C. K_(f) for CH_(3)COOH is 3.9 K kg nol^(-1) .

Calculatate the mass of compound (molar mass = 256 g mol^(-1) be the dissolved in 75 g of benzene to lower its freezing point by 0 .48 k(k_(f) = 5. 12 k kg mol ^(-1) .

The mass of ascorbic acid (C_(6)H_(8)O_(6)) to be dissolved in 100g of acetic acid to lower its freezing point by 1.5^(@)C in g is : ( K_(f) for acetic acid is "4.0 K kg mol"^(-1) )

How much polystrene of molar mass 9000 g mol ^(-1) would have to be dissolved in 100 g of C_(6) H_(6) to lower its freezing point by 1.05 K ?