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How much C(2)H(5)OH should be added to 1...

How much `C_(2)H_(5)OH` should be added to 1 litre `H_(2)O` so that it will not freeze at `-20^(@)C` ?
`K_(f) =1.86^(@)C//m`.

Text Solution

Verified by Experts

Mass of 1 litre water = 1000g
`becauseDeltaT=K_(f)xx(w_(B)xx1000)/(m_(B)xxw_(A))`
`20=1.86xx(w_(B) xx1000)/(46xx1000)`
`w_(B)=494.6g`.
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