An aqueous solution of copper sulphate was left out in the hot sun. d heat caused some of the d water to evaporate fr d solution. d original 150g solution had a concentration of 10% by mass. if d remaining solution has a concentration of 15% by mass, wat volume volume of water evaporated?
1) 10 ml 2) 15 ml
3) 50 ml 4) 100 ml