Calculate the molecular mass of the nonionic solutes: 64.3 g of solute in 390 g of water raises the boiling point to 100.680 degrees C.

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boiling point eleveation= Kb*molality
.680=molessolute/kgwater * .52

solve for molessolute, then molessolute=massingrams/molemass and you can solve for massingrams.

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