The molal elevation constant for water is `0.56 K kg mol^(-1)`. Calculate the boiling point of a solution made by dissolving 6.0g of urea `(NH_(2)CONH_(2))` in 200g of water.

Options

A. `10.028^(@)C`
B. `100.28 ^(@)C`
C. `50.14 ^(@)C`
D. none of these.

Answer

B

Explanation

`Delta T_(b) = (1000 xx K_(b) xx W_(2))/(W_(1)M_(2))=(1000 xx 0.56 xx 6.0)/(200 xx 60)=0.28^(@),`
`T^(@) + Delta T_(b) = 100^(@) + 0.28=100.28^(@) C`