Chemistry

Problem

A commercial sample of cyclohexane freezes at

6.0^\circ\text{C}

. If freezing point of cyclohexane is

6.5^\circ

and

K_f = 200 \text{ K molality}^{-1}

, then purity of sample is : a. 99.8% b. 98% c. 90.9% d. 99.5%