How much in mass of CaO in needed to prepare 500 mL of a 7.5% mass-volume solution?

Question

someone help me answering this

Answer 1

7.5% m/v means 7.5 g CaO per 100 ml soln

500 ml x 7.5 g/100 ml = 37.5 g CaO

Or you could arrive at the same answer by taking 7.5% of 500 ml = 0.075 x 500 = 37.5 g