Water is added to the solution M such that the mole fraction of water in the solution becomes `0.9`. The boiling point of this solution is

Options

A. `380.4 K`
B. `376.2 K`
C. `375.5 K`
D. `354.7 K`

Answer

B

Explanation

`(T'_(b))_(sol^(n)) = (T_(b))_(solvent) +K_(b)m`
`= 373 +0.52 xx (0.1)/(0.9 xx 18//1000)`
`= 373 +0.52 xx 6.173`
`= 376.2 K`