A solution contains 4.46 g KCl in 178 mL of solution. The density of the KCl solution is 1.11 g/ml.
What is the percent (m/m) for the potassium chloride solution?
%KCl w/w (or m/m) means grams KCl/100 g solution. You have g KCl in the problem. Convert 178 mL solution to grams.
mass = volume x density
mass = 178 mL x 1.11 g/mL = g soln.
Then %KCl = (grams KCl/g soln)*100 = ??