How does kinetic energy transform into potential an then back again?

Why doesn't heat added to water make the tempature rise above 100c

What is the mass of 2.00 l of an intravenous glucose solution with a density of 1.15 g/ml?

Some liquids can be distilled, but only at temperatures that are so high that it is impractical, or so high the compound decomposes. explain why distillation such compounds at significantly less than atmospheric pressure (some degree of vacuum) would solve this problem.