QUESTION 4\ A

0.85g

sample of an unknown substance (nonelectrolyte) is mixed with

100.0g

of benzene. The freezing point depression was

0.47\\\\deg C

. What is the molar mass of the unknown substance?

k

f of benzene is

5.12\\\\deg (C)/(m)

.\ a.

10.5(g)/(m)ol

\ b.

930(g)/(m)ol

\ c.

81(g)/(m)ol

\ d.

77(g)/(m)ol

\ e.

93(g)/(m)ol

A 0.85g sample of an unknown substance (nonelectrolyte) is mixed with 100.0g of benzene. The freezing point depression was 0.47C. What is the molar mass of the unknown substance? kf of benzene is 5.12C/m. a. 10.5g/mol b. 930g/mol c. 81g/mol d. 77g/mol e. 93g/mol