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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

11.79 g

B

1.179 g

C

2.34 g

D

23.4 g

Text Solution

Verified by Experts

The correct Answer is:
B
`Delta T_(f) = i k_(f)m`
` 0.744 = 2 xx 1.86 xx m`
or m = 0.2
Amount of NaCl to be dissolved `= 0.2 xx 58.5 = 11.7 g` in 1000 g or 1.179 g in 100 g.
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