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Molarity worksheet

Grades 10–11 · CCSS HSA.CED.A.4

Solve each problem and show your work. Round answers to 2 decimal places where needed.

1.
Problem 1.
- Solve for: Mass of solute
- Molar mass of solute: 60 g/mol
- Molarity: 0.2 M
- Volume of solution: 580 mL
Find: Mass of solute
Answer
2.
Problem 2.
- Solve for: Moles of solute
- Molarity: 0.2 M
- Volume of solution: 500 mL
Find: Moles of solute
Answer
3.
Problem 3.
- Solve for: Molarity (concentration)
- Amount of solute given as: Mass and molar mass
- Mass of solute: 6.2 g
- Molar mass of solute: 70 g/mol
- Volume of solution: 600 mL
Find: Molarity
Answer
4.
Problem 4.
- Solve for: Molarity (concentration)
- Amount of solute given as: Moles
- Moles of solute: 0.1 mol
- Volume of solution: 500 mL
Find: Molarity
Answer
5.
Problem 5.
- Solve for: Moles of solute
- Molarity: 0.2 M
- Volume of solution: 625 mL
Find: Moles of solute
Answer
6.
Problem 6.
- Solve for: Mass of solute
- Molar mass of solute: 80 g/mol
- Molarity: 0.2 M
- Volume of solution: 600 mL
Find: Mass of solute
Answer
7.
Problem 7.
- Solve for: Volume of solution
- Amount of solute given as: Moles
- Moles of solute: 0.1 mol
- Molarity: 0.2 M
Find: Volume of solution
Answer
8.
Problem 8.
- Solve for: Moles of solute
- Molarity: 0.2 M
- Volume of solution: 550 mL
Find: Moles of solute
Answer
9.
Problem 9.
- Solve for: Molarity (concentration)
- Amount of solute given as: Mass and molar mass
- Mass of solute: 5.5 g
- Molar mass of solute: 48 g/mol
- Volume of solution: 400 mL
Find: Molarity
Answer
10.
Problem 10.
- Solve for: Molarity (concentration)
- Amount of solute given as: Moles
- Moles of solute: 0.1 mol
- Volume of solution: 760 mL
Find: Molarity
Answer

Answer key: Molarity worksheet

1. Mass of solute: 6.96 g
1. Change the volume to L, the unit the formula works in
  $580 mL \times 0.001$ $= 0.58 L$
2. Multiply moles per liter by the liters you want, to get the moles (n) you need
  $n$ $= 0.2 M \times 0.58 L$ $= 0.116 mol$
3. Multiply the moles by the molar mass (grams per mole) to get the grams to weigh out
  $m$ $= 0.116 mol \times 60 g/mol$ $= 6.96 g$
2. Moles of solute: 0.1 mol
1. Change the volume to L, the unit the formula works in
  $500 mL \times 0.001$ $= 0.5 L$
2. Multiply moles per liter by the liters you want, to get the moles (n) you need
  $n$ $= 0.2 M \times 0.5 L$ $= 0.1 mol$
3. Molarity: 0.15 mol/L (M)
1. Change the volume to L, the unit the formula works in
  $600 mL \times 0.001$ $= 0.6 L$
2. Divide the mass by the molar mass to count the moles (n) of what you dissolved
  $n$ $= \frac{6.2 g}{70 g/mol}$ $= 0.0885714286 mol$
3. Divide the moles by the liters of solution to get the molarity (c), moles per liter
  $c$ $= \frac{0.0885714286 mol}{0.6 L}$ $= 0.1476190476 M$
4. Molarity: 0.2 mol/L (M)
1. Change the volume to L, the unit the formula works in
  $500 mL \times 0.001$ $= 0.5 L$
2. Divide the moles by the liters of solution to get the molarity (c), moles per liter
  $c$ $= \frac{0.1 mol}{0.5 L}$ $= 0.2 M$
5. Moles of solute: 0.13 mol
1. Change the volume to L, the unit the formula works in
  $625 mL \times 0.001$ $= 0.625 L$
2. Multiply moles per liter by the liters you want, to get the moles (n) you need
  $n$ $= 0.2 M \times 0.625 L$ $= 0.125 mol$
6. Mass of solute: 9.6 g
1. Change the volume to L, the unit the formula works in
  $600 mL \times 0.001$ $= 0.6 L$
2. Multiply moles per liter by the liters you want, to get the moles (n) you need
  $n$ $= 0.2 M \times 0.6 L$ $= 0.12 mol$
3. Multiply the moles by the molar mass (grams per mole) to get the grams to weigh out
  $m$ $= 0.12 mol \times 80 g/mol$ $= 9.6 g$
7. Volume of solution: 0.5 L
1. Divide the moles by the molarity to find how many liters (V) of solution to make
  $V$ $= \frac{0.1 mol}{0.2 M}$ $= 0.5 L$
8. Moles of solute: 0.11 mol
1. Change the volume to L, the unit the formula works in
  $550 mL \times 0.001$ $= 0.55 L$
2. Multiply moles per liter by the liters you want, to get the moles (n) you need
  $n$ $= 0.2 M \times 0.55 L$ $= 0.11 mol$
9. Molarity: 0.29 mol/L (M)
1. Change the volume to L, the unit the formula works in
  $400 mL \times 0.001$ $= 0.4 L$
2. Divide the mass by the molar mass to count the moles (n) of what you dissolved
  $n$ $= \frac{5.5 g}{48 g/mol}$ $= 0.1145833333 mol$
3. Divide the moles by the liters of solution to get the molarity (c), moles per liter
  $c$ $= \frac{0.1145833333 mol}{0.4 L}$ $= 0.2864583333 M$
10. Molarity: 0.13 mol/L (M)
1. Change the volume to L, the unit the formula works in
  $760 mL \times 0.001$ $= 0.76 L$
2. Divide the moles by the liters of solution to get the molarity (c), moles per liter
  $c$ $= \frac{0.1 mol}{0.76 L}$ $= 0.1315789474 M$