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After adding non-volatile solute freezin...

After adding non-volatile solute freezing point of water decreases to `-0.186^(@)C`. Calculate `Delta T_(b)` if `K_(f)=1.86 " K kg mol"^(-1)` and `K_(b)=0.21 "K kg mol"^(-1)`.

A

1.86

B

0.521

C

0.0186

D

0.0521

Text Solution

Verified by Experts

The correct Answer is:
D
`DeltaT_(f)=K_(f)xxm`
`0.186=1.86 xx m`
or `m=(0.186)/(1.86)=0.10`
`Delta T_(b)=K_(b)xx m=0.521 xx 0.10`
`DeltaT_(b)=K_(b) xx m= 0.521 xx 0.10`
`=0.0521`.
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