 So we have one more, and that's how would you prepare 1.25 liters of a 600 millimolar aqueous solution of sodium bicarbonate. So this is a little bit more complicated, but again, one sodium, we're just going to break it down, one hydrogen, one carbon, and three oxygen. We're going to multiply those by one, by one, by one, and by three. We're going to add those together. We're going to have 84.006 grams per mole. And so we're looking for a 600 millimolar aqueous solution. We know that 600 millimolar is 600 millimoles per liter. And we need 1.25 liters of this solution. So the liters will cancel. And we'll know we need 750 millimoles of sodium bicarbonate to make this solution. And so we'll know that 84.006 grams per 1,000 millimoles. And here we're just substituting 1,000 millimoles for one mole. We're going to say we need x grams for 750 millimoles. Multiply both sides by 750 millimoles. The moles will cancel. 750 times 84.006 divided by 1,000 equals 63.005 grams. And we'll want to dissolve that in water and bring to the volume of 1.25 liters.