Molecular Weight by Freezing Point Depression of Solution

A 0.573g sample of a nonvolatile solute is added to 15.6g of napthalene and the mixture warmed until melted. The freezing point of the solution was determined and found equal to 78.1C. The freezing point of naphthalene is 80.2C. How do you find out if the boiling pt and the vapor pressure increases or decreases?

How do you find the molecular weight?

Also how do I find the highest to lowest freezing points? Example-0.1m Nacl, 0.1m C12H22O11, 0.1m Ba(NO3)2

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