`1.0 g` of non-electrolyte solute dissolved in `50.0 g` of benzene lowered the freezing point of benzene by `0.40 K`. The freezing point depression constant of benzene is `5.12 kg mol^(-1)`. Find the molecular mass of the solute.

Explanation

`M_(B) = (K_(f) xx 1000 xx w_(B))/(w_(A) xx Delta T_(f))`
` = (5.12 xx 1000 xx 1.0) /(50 xx 0.40) =256 g mol^(-1)`