The molality of a urea solution in which ` 0.0100 g ` of urea, ` [(NH_(2))_(2)CO] ` is added to ` 0.3000 dm^(3) `of water at STP is

Options

A. `0.555m`
B. `5.55 xx 10^(-4)m`
C. `33.3 m`
D. `3.33 xx 10^(-2)m`

Answer

B

Explanation

`m = (n)/(WCkg) = (0.01//60)/(0.3kg) = 5.55 xx 10^(-4) mol//kg`