Calculate the mass of Water (H₂O) required to dissolve 50 g of KCl to prepare a 20% solution by mass.
- 150 g
- 200 g
- 250 g
- 400 g
📝 Batafsil tushuntirish
Mass % = [mass solute / (mass solute + mass solvent)] * 100.20 = [50 / (50 + x)] * 100.
0.2(50 + x) = 50 => 10 + 0.2x = 50 => 0.2x = 40 => x = 200 g.