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. So we have the number of grams we need to add. But our question asks us to find the number of moles. To find that, we need to find the molecular weight of sodium chloride.