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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

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

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

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

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

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

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

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 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

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 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

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

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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nmdcat.online Chemistry NMDCAT MCQs
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
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