The mass of ascorbic acid (C(6)H(8)O(6))...

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)`)

A

17.6

B

8.8

C

6.6

D

13.2

Text Solution

Verified by Experts

The correct Answer is:

C

`DeltaT=k_(f)xx(w_(f)xx1000)/(m_(B)xxw_(A))`
`1.5=4xx(w_(B)xx1000)/(176xx100)`
`w_(B)=6.6g`]

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