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Practice Questions

Given 2Al + 3Br₂ → 2AlBr₃, the theoretical yield of AlBr₃ from 3 moles of Br₂ is:

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

The reaction of 10 g of H₂ (5 mol) with 32 g of O₂ (1 mol) produces H₂O. The theoretical yield of water is (2H₂ + O₂ → 2H₂O):

A. 18 g
B. 36 g ✓
C. 90 g
D. 10 g
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Jun 23, 2026

For the reaction 2KClO₃ → 2KCl + 3O₂, the theoretical yield of O₂ from 1 mole of KClO₃ is:

A. 1 mole
B. 1.5 moles ✓
C. 2 moles
D. 3 moles
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Jun 23, 2026

The complete combustion of 32 g of methane (CH₄=16 g/mol) produces a theoretical yield of ___ grams of CO₂ (CO₂=44 g/mol).

A. 32 g
B. 44 g
C. 88 g ✓
D. 16 g
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Jun 23, 2026

The theoretical yield of H₂ gas at STP from the reaction of 1 mole of Zn with excess HCl (Zn + 2HCl → ZnCl₂ + H₂) is:

A. 11.2 dm³
B. 22.4 dm³ ✓
C. 2 dm³
D. 1 dm³
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Jun 23, 2026

Given 2Na + Cl₂ → 2NaCl, the theoretical yield of NaCl from 46 g of Na is (Na=23 g/mol; NaCl=58.5 g/mol):

A. 58.5 g
B. 117 g ✓
C. 46 g
D. 23 g
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Jun 23, 2026

The reaction of 1 mole of CH₄ with excess O₂ (CH₄ + 2O₂ → CO₂ + 2H₂O) produces a theoretical yield of ___ grams of H₂O. (H₂O=18 g/mol)

A. 18 g
B. 36 g ✓
C. 9 g
D. 2 g
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Jun 23, 2026

For CaCO₃ → CaO + CO₂, the theoretical yield of CaO from 50 g of CaCO₃ is (CaCO₃=100 g/mol; CaO=56 g/mol):

A. 56 g
B. 50 g
C. 28 g ✓
D. 100 g
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Jun 23, 2026

The theoretical yield of MgO from the reaction of 24 g of Mg (Mg=24 g/mol) is (2Mg + O₂ → 2MgO; MgO=40 g/mol):

A. 24 g
B. 32 g
C. 40 g ✓
D. 80 g
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Jun 23, 2026

Given N₂ + 3H₂ → 2NH₃, the theoretical yield of NH₃ from 3 moles of H₂ is:

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