 So now we're going to talk a little bit about molarity. Molarity is abbreviated with a capital M, and it's a measure of concentration. So it tells us the number of moles per liter of solution. So it's a concentration. And it tells us, because it tells us the number of moles, it tells us that there are 6.023 times 10 to the 23rd atoms or molecules per one liter of solution. So we talked previously about how to measure out 6.023 times 10 to the 23rd atoms or molecules using the molar mass. And so we're just going to do a quick example determining how to make one molar sodium chloride solution. So again, we go to our periodic table, and we see that sodium has a molar mass of 22.99 and chlorine 35.45. So 22.99 plus 35.45. So there's 58.44 grams per mole. If we want to figure out a one molar solution, one molar is equal to one molar is equal to one mole per liter. So the moles would cancel out there, and a one molar solution would have 58.44 grams of sodium chloride per liter.