Question

In 500 g solutie cu concentratia de 15% cate g de masa dizolvata si cate g de apa avem?

Answer 1

md = c*ms/100
md = 15*500/100
md = 75 g

ms= md + m apa
500 = 75 + m apa
m apa = 500-75
m apa = 425 g.