At certain Hill-station pure water boils at `99.725^(@)C`. If `K_(b)` for water is `0.513^(@)C kg mol^(-1)`, the boiling point of `0.69m` solution of urea will be:

Options

A. `100.079^(@)C`
B. `103^(@)C`
C. `100.359^(@)C`
D. un predictable

Answer

A

Explanation

`DeltaT_(b) = 0.513 xx 0.69`
`T_("final") - 99.725 = 0.35397`
`T_("final") = 100.079`