When a 2.5 mol of sugar (C12H22O11) are added to a certain amount of water the boiling point is raised by 1 Celsius degree. If 2.5 mol of aluminum nitrate is added to the same amount of water, by how much will the boiling point be changed?

Question

When a 2.5 mol of sugar (C12H22O11) are added to a certain amount of water the boiling point is raised by 1 Celsius degree.  If 2.5 mol of aluminum nitrate is added to the same amount of water, by how much will the boiling point be changed?

DrBob222 · Answer

For sugar:
delta T = Kb*m
Substitute and solve for m = molality.

Then m = mols kg solvent. You know mols and m, solve for kg solvent

Using that kg solvent, convert 2.5 mol Al(NO3)3 to m

Then plug m and Kb into
delta T = i*Kb*m
You know Kb and m. The van't Hoff factor for Al(NO3)3 is 4.