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Yield

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Practice Questions

To obtain an actual yield of 40g of a product with a 80% yield, one must start with reactants calculated to produce a theoretical yield of:

A. 32 g
B. 40 g
C. 50 g ✓
D. 80 g
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Jun 23, 2026

If the percent yield for a reaction is 90% and a student needs to produce 27 g of product, they should aim for a theoretical yield of:

A. 24.3 g
B. 27 g
C. 30 g ✓
D. 90 g
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Jun 23, 2026

The theoretical yield of a reaction is 10 moles. If the percent yield is 65%, the moles of product actually obtained are:

A. 10 moles
B. 6.5 moles ✓
C. 15.4 moles
D. 65 moles
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Jun 23, 2026

In the reaction Zn + S → ZnS, 65 g of Zn is supposed to make 97 g of ZnS. If the percent yield is 80%, the actual mass of ZnS produced is:

A. 97 g
B. 80 g
C. 77.6 g ✓
D. 121.25 g
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Jun 23, 2026

A student needs 5 g of a compound. The reaction to make it has a 50% yield. The student should start with enough reactants to theoretically produce:

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

The actual yield is 15 g and the percent yield is 75%. The theoretical yield is:

A. 11.25 g
B. 15 g
C. 20 g ✓
D. 25 g
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Jun 23, 2026

The reaction 2Mg + O₂ → 2MgO has a theoretical yield of 40 g of MgO. If the reaction has an 85% yield, the mass of MgO produced is:

A. 40 g
B. 85 g
C. 34 g ✓
D. 47 g
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Jun 23, 2026

A lab procedure states that the reaction has a 95% yield. If the theoretical yield is 10 g, the expected actual yield is:

A. 10 g
B. 9.5 g ✓
C. 10.5 g
D. 95 g
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Jun 23, 2026

If you obtain 4.5 g of a product and the percent yield was 90%, the theoretical yield was:

A. 4.05 g
B. 4.5 g
C. 5.0 g ✓
D. 9.0 g
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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

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

If the actual yield is 2.5 g and the percent yield is 50%, the theoretical yield must be:

A. 1.25 g
B. 2.5 g
C. 5.0 g ✓
D. 10.0 g
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Jun 23, 2026

A chemist expects to get 150 g of aspirin but only gets 120 g. The percent yield is:

A. 75%
B. 80% ✓
C. 90%
D. 125%
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Jun 23, 2026

When 1 mole of N₂ reacts with 3 moles of H₂, the theoretical yield of NH₃ is 34 g. If 17 g is produced, the percent yield is:

A. 17%
B. 34%
C. 50% ✓
D. 100%
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Jun 23, 2026

A reaction has an actual yield of 35 g and a theoretical yield of 40 g. Its percent yield is:

A. 80%
B. 87.50% ✓
C. 90%
D. 114%
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Jun 23, 2026

If the percent yield is 85% and the theoretical yield is 200 g, the actual yield is:

A. 85 g
B. 170 g ✓
C. 200 g
D. 235 g
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Jun 23, 2026

A reaction has a theoretical yield of 88 g. If its percent yield is 75%, the actual yield is:

A. 117.3 g
B. 88 g
C. 75 g
D. 66 g ✓
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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

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
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