A mass of 0.630g of NaCl is dissolved in 525g of water. Correct The total mass of the solution in this case is 525.63g, which makes the percent by mass come to 0.11985617%. However, when rounded to the correct number of significant figures, the answer becomes 0.120% Quite often, the mass of the solute is so small compared to the mass of the solution that massofsolutionmassofsolutemassofsolventmassofsolute Part D Calculate the concentration of the salt solution in parts per million