Question

A solution is made by dissolving 14.0 g of potassium chloride to a final volume of 78.9 mL solution. what is the weight/weight % or the percent by mass of the solute?
(use 1.00 g/mL for the density of water)

Answer 1

The answer is 17.7%. 14.0/78.9×100=17.7%

Answer 2

Mass of solute that is KCl given as=14.0 g

Mass of the solution=Volume \times density

Mass of the solution=78 mL\times 1g cm^{-3}

Mass of the solution=78 g

weight/weight % of the solute=\frac{Mass of the solute}{Mass of the solution}\times 100

weight/weight % of the solute that is KCl=\frac{14}{78}\times 100

weight/weight % of the solute that is KCl=17.9

So the weight/weight % of the solute that is KCl found to be 17.9 .