200 g of a non-electrolye is dissolved in 1000 g of water. The boiling point of the solution is then measured to be 101.5 C. What is the molar mass?

(the Kb for water is 0.51 C/m)

I know deltaT = 0.51 C/m but where do I go from there?

delta T = Kb*m

Calculate m

m = moles/kg solvent.
Calculate moles

moles = grams/molar mass
Calculate molar mass.