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Calculate the approximate DeltaT(b) (in ...

Calculate the approximate `DeltaT_(b)` (in K) for 0.001 molal KCl solution, if its van' t-Hoff factor is 1.98 `[K_(b)" of water is -0.52 K kg mol"^(-1)]`

A

1.03

B

`1.03xx10^(-3)`

C

`1.03xx10^(-5)`

D

`1.03xx10^(-1)`

Text Solution

Verified by Experts

The correct Answer is:
B
We know that
`Delta T_(b)= iK_(b)m` `(because Delta T_(b)= i.K_(b)xxm)`
where, `DeltaT_(b)` = elivation in boiling point (to time)
I = van. t - Hoff factor (1.98)
`K_(b)` = molal elevation constant (o.52)
m = molality (0.001 m)
`DeltaT _(b)` = 1.98 xx 0.52 xx 0.0010296
`DeltaT_(b) = 1.03xx10^(-3)`
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