Chemistry worksheet on molarity calculations with five problems involving solution preparation and concentration.

1. Molarity = moles of solute / liters of solution
Molar mass of NaCl = 58.44 g/mol
Moles of NaCl = 58 g / 58.44 g/mol = 0.992 mol
Volume = 1.0 L
Molarity = 0.992 mol / 1.0 L = 0.992 M

2. Molarity = moles of solute / liters of solution
Molar mass of AgNO₃ = 169.87 g/mol
Moles of AgNO₃ = 10.0 g / 169.87 g/mol = 0.0589 mol
Volume = 500 mL = 0.500 L
Molarity = 0.0589 mol / 0.500 L = 0.118 M

3. Molarity = moles of solute / liters of solution
Moles of KNO₃ = Molarity × Volume = 0.500 mol/L × 2.00 L = 1.00 mol
Molar mass of KNO₃ = 101.10 g/mol
Mass of KNO₃ = 1.00 mol × 101.10 g/mol = 101.1 g

4. Molarity = moles of solute / liters of solution
Molar mass of KCl = 74.55 g/mol
Moles of KCl = 5.0 g / 74.55 g/mol = 0.0671 mol
Volume = moles / molarity = 0.0671 mol / 0.25 mol/L = 0.268 L = 268 mL

5. Molarity = moles of solute / liters of solution
Moles of CuSO₄·5H₂O = Molarity × Volume = 0.10 mol/L × 0.100 L = 0.010 mol
Molar mass of CuSO₄·5H₂O = 249.68 g/mol
Mass of CuSO₄·5H₂O = 0.010 mol × 249.68 g/mol = 2.50 g