Stoichiometry worksheet with answers

Free printable Stoichiometry worksheet: 6 problems from easy to exam level, with an answer key. Print it or save it as a PDF.

New worksheet Practise online with hints

For teachers: free to print, copy and use in class. Every new worksheet has new values and its own answer key. A link to ExamProblems on your course page is appreciated.

Name: ____________________ Date: ____________

1.Easy

For the reaction Fe₂O₃ + 3CO → 2Fe + 3CO₂, what mass m of Fe forms from 25 g of Fe₂O₃? Assume the other reactants are in excess.

M(Fe₂O₃) = 159.69 g/molM(Fe) = 55.85 g/mol

m = g

2.Easy

For the reaction N₂ + 3H₂ → 2NH₃, what mass m of NH₃ forms from 12 g of N₂? Assume the other reactants are in excess.

M(N₂) = 28.02 g/molM(NH₃) = 17.03 g/mol

m = g

3.Medium

20 g of CH₄ and 24 g of O₂ react according to CH₄ + 2O₂ → CO₂ + 2H₂O. What mass m of H₂O can form?

M(CH₄) = 16.04M(O₂) = 32M(H₂O) = 18.02 g/mol

m = g

4.Medium

8 g of CH₄ and 48 g of O₂ react according to CH₄ + 2O₂ → CO₂ + 2H₂O. What mass m of CO₂ can form?

M(CH₄) = 16.04M(O₂) = 32M(CO₂) = 44.01 g/mol

m = g

5.Hard

In the reaction 2Na + Cl₂ → 2NaCl, 8 g of Na reacts completely (the other reactants are in excess) and 16.68 g of NaCl is collected. Find the percent yield Y.

M(Na) = 22.99 g/molM(NaCl) = 58.44 g/molactual: 16.68 g

Y = %

6.Hard

In the reaction C₃H₈ + 5O₂ → 3CO₂ + 4H₂O, 8 g of C₃H₈ reacts completely (the other reactants are in excess) and 9.15 g of H₂O is collected. Find the percent yield Y.

M(C₃H₈) = 44.1 g/molM(H₂O) = 18.02 g/molactual: 9.15 g

Y = %

Answer key

1. m = 17.49 g
2. m = 14.59 g
3. m = 13.52 g
4. m = 21.95 g
5. Y = 82.02 %
6. Y = 69.98 %

Full step-by-step solutions: practise this topic on examproblems.com.