A solution of 0.643 g of an organic compound in 50 mL of benzene (density 0.879 g/mL)…

CHEMISTRY · Subjective · AP · Chemistry · Properties of Substances and Mixtures · Properties of Substances and Mixtures

Problem

A solution of 0.643 g of an organic compound in 50 mL of benzene (density 0.879 g/mL) lowered its freezing point from

5.51^\circ\text{C}

5.03^\circ\text{C}

. Calculate the molar mass of solid.

K_f

for benzene is

5.12 \text{ K mol}^{-1} \text{ kg}

. (IIT 1992)