2g of a non electrolyte solute dissolved in 75g of benzene lowered the freezing point of benzene by 0.20 k. The freezing point depression constant of benzene is 5.12 K Kg mol ^(-1). Find the molar mass of the solute.

2g of a non electrolyte solute dissolved in 75g of benzene lowered the

1.	2g of a non electrolyte solute dissolved in 75g of benzene lowered the freezing point of benzene by 0.20 k. The freezing point depression constant of benzene is 5.12 K Kg mol ^(-1). Find the molar mass of the solute.
Answer» Solution :`W_(2) =2g, W_(1) =75G, Delta T _(f)=0.2 K, k _(f) =5.12 kg mol ^(-1) , M _(2)` = ? `M _(2) = (K _(f) XX W _(2) xx 1000)/( Delta T_(f) xx W_(1)) = (5.12 xx 2 xx 1000)/( 0.2 xx 75) = 682.66 g mol ^(-1)`