Concentration

Molar mass, grams and moles: practice problems

Work out the molar mass. Every answer here is computed by the same tested calculator the rest of the site uses, so a solution can never drift away from the maths.

Problem 1 Molar mass, grams and moles

Work out the molar mass.

  • Molar mass (g/mol): 58.44
  • Amount (moles): 0.25 mol
Show the answer and the working

That is 14.61 g of NaCl.

  1. Derive mass: m = n · M = 14.61

Open this in the calculator to change the numbers.

Problem 2 Molar mass, grams and moles

Work out the molar mass.

  • Solve for: Moles
  • Molar mass (g/mol): 180.16
  • Mass: 200 mg
Show the answer and the working

That is 0.00111 mol of C6H12O6.

  1. Derive amount: n = m / M = 0.00111

Open this in the calculator to change the numbers.

Problem 3 Molar mass, grams and moles

Work out the molar mass.

  • Solve for: Moles
  • Molar mass (g/mol): 121.76
  • Mass: 7 g
Show the answer and the working

That is 0.05749 mol of Sb.

  1. Derive amount: n = m / M = 0.05749

Open this in the calculator to change the numbers.

Problem 4 Molar mass, grams and moles

Work out the molar mass.

  • Solve for: Moles
  • Molar mass (g/mol): 180.16
  • Mass: 100 mg
Show the answer and the working

That is 0.0005551 mol of C6H12O6.

  1. Derive amount: n = m / M = 0.0005551

Open this in the calculator to change the numbers.

Problem 5 Molar mass, grams and moles

Work out the molar mass.

  • Solve for: Moles
  • Molar mass (g/mol): 121.76
  • Mass: 5.5 g
Show the answer and the working

That is 0.04517 mol of Sb.

  1. Derive amount: n = m / M = 0.04517

Open this in the calculator to change the numbers.

Problem 6 Molar mass, grams and moles

Work out the molar mass.

  • Molar mass (g/mol): 58.44
  • Amount (moles): 0.5 mol
Show the answer and the working

That is 29.22 g of NaCl.

  1. Derive mass: m = n · M = 29.22

Open this in the calculator to change the numbers.

Problem 7 Molar mass, grams and moles

Work out the molar mass.

  • Solve for: Moles
  • Molar mass (g/mol): 180.16
  • Mass: 150 mg
Show the answer and the working

That is 0.0008326 mol of C6H12O6.

  1. Derive amount: n = m / M = 0.0008326

Open this in the calculator to change the numbers.

Problem 8 Molar mass, grams and moles

Work out the molar mass.

  • Solve for: Moles
  • Molar mass (g/mol): 121.76
  • Mass: 5 g
Show the answer and the working

That is 0.04106 mol of Sb.

  1. Derive amount: n = m / M = 0.04106

Open this in the calculator to change the numbers.

Problem 9 Molar mass, grams and moles

Work out the molar mass.

  • Molar mass (g/mol): 58.44
  • Amount (moles): 0.1 mol
Show the answer and the working

That is 5.844 g of NaCl.

  1. Derive mass: m = n · M = 5.844

Open this in the calculator to change the numbers.

Problem 10 Molar mass, grams and moles

Work out the molar mass.

  • Solve for: Moles
  • Molar mass (g/mol): 180.16
  • Mass: 250 mg
Show the answer and the working

That is 0.001388 mol of C6H12O6.

  1. Derive amount: n = m / M = 0.001388

Open this in the calculator to change the numbers.

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