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After adding non-volatile solute, freezi...

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) = 0.521 "K kg mol"^(-1)`

A

0.0521 K

B

0.0186 K

C

0.521 K

D

1.86 K

Text Solution

Verified by Experts

The correct Answer is:
a
`DeltaT_(f)=K_(f)xxm,DeltaT_(b)xx=K_(b)xxm`
`(DeltaT_(f))/(DeltaT_(b))=K_(f)/K_(b)or DeltaT_(b)=(DeltaT_(f)xxK_(b))/(k_(f))`
`DeltaT_(b)=((0.186K)xx0.521K kg mol^(-1))/((186 K kg mol^(-1)))=0.0521 K`
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