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Calculate the mass of ascorbic acid ( Vi...

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)`

Text Solution

Verified by Experts

`DeltaT_(f) = 1.5^(@)`
`M = 6xx12+1xx8+6xx16=176`
`M = (K_(f) xx 1000 xx w_(B))/(w_(A) xx DeltaT_(f))`
`176 = (3.9 xx 1000 xx w_(B))/(75 xx 1.5)`
`w_(B) = (176 xx 75 xx 1.5)/(3.9 xx 1000) = 5.08 g`
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