Question

If 32.5 grams of CaO are dissolved in 212 grams of water, what is the concentration of the solution in percent by mass?

Answer 1

percent by mass of CaO= Mass of solute/ moles of solution x 100%

(32.5g)/ (32.5g+212g) x 100%
= 13.29 and when you round it becomes 13.3% CaO

Answer 2

13.3% would be the correct answer!