If 1373 g of a substance is dissolved in 2315 g of cyclohexane solvent, the boiling point of the solution is 87.69 oC. Calculate the apparent molar mass (g/mol) of substance.

Answer 1

delta T = Kb*molality
Calculate molality, then
molality = moles/kg solvent
Calculate moles, then
moles = g/molar mass,
calculate molar mass.
Post your work if you get stuck.

Answer 2

You will need to look up the boiling point of cyclohexane if it isn't given in the problem.