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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
Derive amount: n = m / M = 0.001388 Open this in the calculator to change the numbers.
More concentration practice
Same topic, different calculation Convert between molarity, mass, volume, and moles for a reagent, in any direction.
Convert %w/v, %w/w, %v/v ⇄ g/L and molarity.
Stuck on one of them? Open it in the calculator and it shows the same working step by step, with the units checked and the hazards flagged. Free, no account, and it keeps working offline once the page has loaded.
Open the Molar mass, grams and moles calculator