 So, let's do this one. It says calculate the molarity of the following solution. 0.754 moles potassium nitrate in 225 mils of water. Okay, so how do we calculate that molarity? Well, so it tells us the number of moles of potassium nitrate. 0.754 moles and it tells us the volume of the solution is 225 mils. Well, remember calculating molarity, that's the number of moles over the volume in liters of the solution. So this is the number of moles of the solute. Can you see that solution? Okay, so this is, well, hopefully you guys know, this is the solution. So how do we convert? So we got to convert milliliters to liters range, 1,000 mils. So, this is one over the other divided by liters. So the three sig figs, we got 3.35 and what do we say, molar. 3.35 molar potassium nitrate solution. Does everybody okay with that one? Pretty straightforward one. Any questions on that one?