10.2 g of ascorbic acid is dissolved in 150 g of `CH_3COOH`. The depression in freezing point of resulting solution is ? ( given `k_f` is 3.9 k kg/mole of acetic acid and molar mass of ascorbic acid is 176)

1.355 g of a substance dissolved in 55 g of CH_(3)COOH produced a depression in the freezing point of 0.618^(@)C . Calculate the molecular weight of the substance (K_(f)=3.85)

0.6 mL of acetic acid (CH_(3)COOH) having density 1.06 g mL^(-1) is dissolved in 1 L of water. The depression in freezing point observed for this strength of acid was 0.0205^(@)C .Calculate the Van't Hoff factor and dissociation constant of the acid. K_(f) for H_(2)O=1.86 K kg ^(-1) "mol"^(-1))