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Practice Questions

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

The theoretical yield is always based on the amount of the ______ reactant.

A. initial
B. final
C. limiting ✓
D. excess
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Jun 23, 2026

When 6.5 g of Zn (0.1 mol) reacts with 7.3 g of HCl (0.2 mol), the theoretical yield of ZnCl₂ is (Zn + 2HCl → ZnCl₂; ZnCl₂=136 g/mol):

A. 13.6 g ✓
B. 6.5 g
C. 7.3 g
D. 27.2 g
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Jun 23, 2026

For C₃H₈ + 5O₂ → 3CO₂ + 4H₂O, the theoretical yield of CO₂ from 0.5 moles of C₃H₈ is:

A. 1.5 moles ✓
B. 3 moles
C. 0.5 moles
D. 5 moles
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Jun 23, 2026

The theoretical yield of silver (Ag) from the decomposition of 17 g of AgNO₃ is (2AgNO₃ → 2Ag + 2NO₂ + O₂; Ag=108, AgNO₃=170):

A. 1.08 g
B. 10.8 g ✓
C. 21.6 g
D. 17 g
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Jun 23, 2026
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