Question

Calculate the molar mass of a molecular compound if a solution of 6.70 g of the compound in 22.60 g of water boils at 100.78 degrees C (at 760mmHg).

Answer 1

You must assume this is a non-volatile compounds AND that it is not ionic.
delta T = 100.78-100 = ?
delta T = Kb*molality
You know delta T, look up Kb (about 0.5), solve for m.
m = mols/kg solvent. You kow m and kg waterk solve for mols.
mol = grams/molar mass You know grams and mol solve for molar mass.