So we divide five by 100, get 0.5,
then we bring the bottom over, multiply this whole bottom by 0.5, so we get 0.05 times 180 plus x. When we multiply this out, we get nine plus 0.5 x. We equate that to x because the x was left on the other side. And now we simply solve for x and we get nine equals zero point 95 x. We divide by zero point 95 x and we get 9.47 grams of sodium chloride that we need to add to the solution of ten moles to get a 5% bimass solution of sodium chloride. The final step is to find the number of moles of sodium chloride.