Question

How many grams of Urea(CH4N2O) have to be dissolved into 253g of Chloroform in order for the boiling point to increase by 3.1C?

Answer 1

delta T = Kf*molality
Solve for molality

molality = moles/kg solvent
Solve for moles.

moles = grams/molar mass
Solve for grams.