And if you want to learn more about vapor pressure and how it affects boiling points or freezing points, check out the video below. Now let's get back to our problem. So, before we can apply our two formulas for freezing and boiling points, or the change in temperature for freezing boiling points, we have to find the morality. Because look, we have the I for both cases, it's simply one. We have our constants KB and KF they're given here. What we don't have is our molarity.