And now a higher temperature is required to raise our vapor pressure to that final atmospheric pressure. So more energy is required. In fact, we could use a formula to find the change in the boiling point. So change in boiling point is equal to a constant KB, which is related to the substance being boiled times. The morality so moles over a kilogram of solid times I I is called vonkov factor, and this is the number of particles a single solid molecule dissociates into. So if our solid is sodium chloride, we see that sodium chloride dissociates into exactly two particles.