Determine % by mass of KCl in solution prepared by dissolving 1.18g of KCl in 86.3g of water .

Answer 1

Percent by mass is the mass of a component divided by the total mass of the mixture times 100. In this case the total mass is equal to 1.18g + 86.3g = 87.4 g total. The percent by mass of KCl then is 1.18/87.4 x 100 = 1.35%.