Question

Does 1.0 M KNO3 or 1.5 M KNO3 have a higher boiling point?

Answer 1

 1.5 M KNO3 - both solutions contain KNO3, but the one with higher concentration is 1.5 M, as 1.5 M > 1.0 M. 1.0 M also increases the boiling point, but not to as great an extent as 1.5 M does.