Calculate the mass percent of 3.17 g KCl dissolved in 40.6 g H2O

Question

Calculate the mass percent of solute in each solution

Answer 1

mass % is mass of compound divided by total mass (x100%)

mass of KCl = 3.17 g

total mass = 3.17 g + 40.6 g = 43.77 g

mass % KCl = 3.17 g / 43.77 g (x100%) = 7.24% (3 sig. figs.)