Question

1.10g of an unknown compound reduces the freezing point of 75.22g benzene from 5.53C to 4.92C. What is the molar mass of the compound?

Answer 1

delta T = Kf*molality
Solve for molality

molality = moles/kg solvent
Solve for moles

moles = grams/molar mass
Solve for molar mass.

Answer 2

9.23g/mol

Answer 3

117.5 g/mol

Answer 4

120 g/mol