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A solution of sucrose (molar mass = 342 ...

A solution of sucrose (molar mass `= 342 g mol^(-1))` has been prepared by dissolving 68.5g of sucrose in 1000g of water. The freezing point of the solution obtained will be: `(K_(f)` for water `= 1.86 K kg mol^(-1))`

A

`-0.744^(@)`

B

`-0.372^(@)C`

C

`-0.186^(@)C`

D

`-0.093^(@)C`

Text Solution

Verified by Experts

The correct Answer is:
A
Molarity of solution ` =(7.2//180)/(100) xx 1000 = 0.4`
`Delta T_(f) = k_(f) xx m = 1.86 xx 0.4 = 0.744`
Freezing point of solution ` = 0 .744 = - 0.744^(@)C`
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