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 C₆H₁₂O₆ → 2C₂H₅OH + 2CO₂, what mass m of CO₂ forms from 40 g of C₆H₁₂O₆? Assume the other reactants are in excess.

M(C₆H₁₂O₆) = 180.16 g/molM(CO₂) = 44.01 g/mol

m = g

2.Easy

For the reaction N₂ + 3H₂ → 2NH₃, what mass m of NH₃ forms from 32 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

16 g of N₂ and 10 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

6 g of Fe₂O₃ and 16 g of CO react according to Fe₂O₃ + 3CO → 2Fe + 3CO₂. What mass m of Fe can form?

M(Fe₂O₃) = 159.69M(CO) = 28.01M(Fe) = 55.85 g/mol

m = g

5.Hard

In the reaction N₂ + 3H₂ → 2NH₃, 4 g of N₂ reacts completely (the other reactants are in excess) and 3.99 g of NH₃ is collected. Find the percent yield Y.

M(N₂) = 28.02 g/molM(NH₃) = 17.03 g/molactual: 3.99 g

Y = %

6.Hard

In the reaction CH₄ + 2O₂ → CO₂ + 2H₂O, 10 g of CH₄ reacts completely (the other reactants are in excess) and 24.15 g of CO₂ is collected. Find the percent yield Y.

M(CH₄) = 16.04 g/molM(CO₂) = 44.01 g/molactual: 24.15 g

Y = %

Answer key

1. m = 19.54 g
2. m = 38.9 g
3. m = 19.45 g
4. m = 4.197 g
5. Y = 82.06 %
6. Y = 88.02 %

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