In the first step we write our freezing depression formula and that basically state that's the change in temperature equal there constant times molarity times I I is a bond half factor and in this case it's one. Because our unknown compound does not associate into anything, it stays the way it is. So you plug in our values and we get six -20 or 2.7 degrees Celsius. Divided by 20 our constant Celsius cancels moles goes on top and we get 0.165
moles per kilogram. And this is our Molarity. Now, in the second step, let's look at the formula for molality.