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 2Na + Cl₂ → 2NaCl, what mass m of NaCl forms from 64 g of Na? Assume the other reactants are in excess.

M(Na) = 22.99 g/molM(NaCl) = 58.44 g/mol

m = g

2.Easy

For the reaction C₃H₈ + 5O₂ → 3CO₂ + 4H₂O, what mass m of CO₂ forms from 10 g of C₃H₈? Assume the other reactants are in excess.

M(C₃H₈) = 44.1 g/molM(CO₂) = 44.01 g/mol

m = g

3.Medium

30 g of N₂ and 20 g of H₂ react according to N₂ + 3H₂ → 2NH₃. What mass m of NH₃ can form?

M(N₂) = 28.02M(H₂) = 2.016M(NH₃) = 17.03 g/mol

m = g

4.Medium

8 g of N₂ and 20 g of H₂ react according to N₂ + 3H₂ → 2NH₃. What mass m of NH₃ can form?

M(N₂) = 28.02M(H₂) = 2.016M(NH₃) = 17.03 g/mol

m = g

5.Hard

In the reaction Fe₂O₃ + 3CO → 2Fe + 3CO₂, 12 g of Fe₂O₃ reacts completely (the other reactants are in excess) and 5.88 g of Fe is collected. Find the percent yield Y.

M(Fe₂O₃) = 159.69 g/molM(Fe) = 55.85 g/molactual: 5.88 g

Y = %

6.Hard

In the reaction C₃H₈ + 5O₂ → 3CO₂ + 4H₂O, 16 g of C₃H₈ reacts completely (the other reactants are in excess) and 33.53 g of CO₂ is collected. Find the percent yield Y.

M(C₃H₈) = 44.1 g/molM(CO₂) = 44.01 g/molactual: 33.53 g

Y = %

Answer key

1. m = 162.7 g
2. m = 29.94 g
3. m = 36.47 g
4. m = 9.724 g
5. Y = 70.05 %
6. Y = 70 %

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