 Okay, so let's do this one. This one is really similar to the last one we did. A solution was prepared by dissolving 12.4 grams of sodium nitrate and water to produce 95 mils of solution. What's the parts per million of this solution? So, PPM equation is almost exactly the same as the weight volume percentage equation. So PPM equals mass solute over the volume of solution instead of 100% though, it's times 10 to the 6 PPM. So now all we gotta do is plug in these numbers. So the mass of the solute is 12.4 grams. The volume of the solution is 95 mils. The three safe things, so it's going to be 1.10 to the 1, 2, 3, 4, 5. If it's parts per thousand, it would be 10 to the 3, right?