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.

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1.Easy

For the reaction Fe₂O₃ + 3CO → 2Fe + 3CO₂, what mass m of CO₂ forms from 5 g of Fe₂O₃? Assume the other reactants are in excess.

M(Fe₂O₃) = 159.69 g/molM(CO₂) = 44.01 g/mol

m = g

2.Easy

For the reaction Fe₂O₃ + 3CO → 2Fe + 3CO₂, what mass m of CO₂ forms from 100 g of Fe₂O₃? Assume the other reactants are in excess.

M(Fe₂O₃) = 159.69 g/molM(CO₂) = 44.01 g/mol

m = g

3.Medium

6 g of CH₄ and 16 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

10 g of Na and 20 g of Cl₂ react according to 2Na + Cl₂ → 2NaCl. What mass m of NaCl can form?

M(Na) = 22.99M(Cl₂) = 70.9M(NaCl) = 58.44 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 8.14 g of CO₂ is collected. Find the percent yield Y.

M(Fe₂O₃) = 159.69 g/molM(CO₂) = 44.01 g/molactual: 8.14 g

Y = %

6.Hard

In the reaction Fe₂O₃ + 3CO → 2Fe + 3CO₂, 12 g of Fe₂O₃ reacts completely (the other reactants are in excess) and 7.74 g of CO₂ is collected. Find the percent yield Y.

M(Fe₂O₃) = 159.69 g/molM(CO₂) = 44.01 g/molactual: 7.74 g

Y = %

Answer key

1. m = 4.134 g
2. m = 82.68 g
3. m = 9.01 g
4. m = 25.42 g
5. Y = 82.04 %
6. Y = 78.01 %

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