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Practice Questions

The percent yield of a reaction that starts with 10g of reactant and produces 8g of product can only be calculated if the ______ is known.

A. excess reactant
B. rate of reaction
C. theoretical yield ✓
D. actual yield
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Jun 23, 2026

The reaction of excess C₂H₄ with 64g of O₂ should produce 88g of CO₂. If 66g of CO₂ is obtained, the percent yield is:

A. 50%
B. 66%
C. 75% ✓
D. 88%
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Jun 23, 2026

If 16g of CH₄ (1 mol) produces 36g of H₂O (actual yield), and the theoretical yield is 36g, the percent yield is:

A. 50%
B. 75%
C. 90%
D. 100% ✓
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Jun 23, 2026

A reaction with a theoretical yield of 5.0 g has a percent yield of 60%. The mass of product obtained is:

A. 3.0 g ✓
B. 5.0 g
C. 6.0 g
D. 8.3 g
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Jun 23, 2026

Given 2Na + Cl₂ → 2NaCl, 46g of Na theoretically yields 117g of NaCl. If the actual yield is 100g, the percent yield is about:

A. 85.50% ✓
B. 90%
C. 117%
D. 75%
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Jun 23, 2026

The percent yield is 90% and the actual yield is 18 g. The theoretical yield is:

A. 16.2 g
B. 18 g
C. 20 g ✓
D. 90 g
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Jun 23, 2026

The reaction of 24 g of Mg (1 mole) produces 30 g of MgO. The theoretical yield is 40 g. The percent yield is:

A. 60%
B. 75% ✓
C. 80%
D. 133%
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Jun 23, 2026

If 3 moles of H₂ are supposed to produce 2 moles of NH₃, but only 1.5 moles are formed, the percent yield is:

A. 50%
B. 66.70%
C. 75% ✓
D. 150%
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Jun 23, 2026

The decomposition of 100 g of CaCO₃ (theoretical yield of CaO is 56 g) produces 50 g of CaO. The percent yield is approximately:

A. 50%
B. 56%
C. 89% ✓
D. 112%
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Jun 23, 2026

A reaction of 12 g of carbon should produce 44 g of CO₂. If 33 g of CO₂ is produced, the percent yield is:

A. 50%
B. 66.70%
C. 75% ✓
D. 80%
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Jun 23, 2026

A student calculates a theoretical yield of 8.0 g. Their actual yield is 6.0 g. The percent yield is:

A. 60%
B. 80%
C. 133%
D. 75% ✓
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Jun 23, 2026

In the reaction 2H₂ + O₂ → 2H₂O, 4g of H₂ produces 30g of H₂O. The theoretical yield is 36g. The percent yield is:

A. 83.30% ✓
B. 90%
C. 120%
D. 75%
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Jun 23, 2026

The theoretical yield of a reaction is 25 g and its percent yield is 80%. The actual yield is:

A. 25 g
B. 20 g ✓
C. 31.25 g
D. 80 g
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Jun 23, 2026

If 10 g of a product should be formed, but only 7.5 g is obtained, the percent yield is:

A. 25%
B. 50%
C. 75% ✓
D. 100%
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Jun 23, 2026

A reaction has a theoretical yield of 50 g. A student collects 45 g of product. The percent yield is:

A. 80%
B. 90% ✓
C. 100%
D. 111%
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Jun 23, 2026

If 5 moles of A react with 5 moles of B (A + 2B → C), the theoretical yield of C is:

A. 5 moles
B. 2.5 moles ✓
C. 10 moles
D. 7.5 moles
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Jun 23, 2026

The theoretical yield of carbon dioxide gas (in dm³ at STP) from burning 24 g of carbon is (C + O₂ → CO₂; C=12 g/mol):

A. 11.2 dm³
B. 22.4 dm³
C. 44.8 dm³ ✓
D. 33.6 dm³
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Jun 23, 2026

What is the theoretical yield of hydrogen gas (in grams) when 4 moles of Na react with excess water? (2Na + 2H₂O → 2NaOH + H₂; H₂=2 g/mol)

A. 2 g
B. 4 g ✓
C. 6 g
D. 8 g
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Jun 23, 2026

From the reaction 4Fe + 3O₂ → 2Fe₂O₃, the theoretical yield of iron(III) oxide from 4 moles of Fe is:

A. 1 mole
B. 2 moles ✓
C. 3 moles
D. 4 moles
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Jun 23, 2026
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