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Yield

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Practice Questions

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

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

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

For the reaction C + O₂ → CO₂, the theoretical yield of CO₂ from 12 g of Carbon (C=12 g/mol) is:

A. 12 g
B. 22 g
C. 32 g
D. 44 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

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

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 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

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 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

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

A perfect reaction with no loss of product would have a percent yield of exactly:

A. 50%
B. 99%
C. 100% ✓
D. 110%
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Jun 23, 2026

The theoretical yield assumes that ______ of the limiting reactant is converted to product.

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

In industrial chemistry, maximizing the ______ is a primary economic goal.

A. theoretical yield
B. number of side reactions
C. actual yield ✓
D. cost of reactants
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Jun 23, 2026

A low percent yield might prompt a chemist to investigate for:

A. A better balanced equation
B. A faster reaction pathway
C. Possible side reactions or purification issues ✓
D. A different catalyst
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Jun 23, 2026

The percent yield can be thought of as the ratio of what you ______ to what you ______, multiplied by 100.

A. should get, actually got
B. actually got, should get ✓
C. start with, end with
D. end with, start with
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Jun 23, 2026

The amount of product specified in the calculation is the:

A. Actual yield
B. Theoretical yield ✓
C. Mole ratio
D. Excess amount
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Jun 23, 2026

In the reaction 2H₂ + O₂ → 2H₂O, the theoretical yield of water from 2 moles of H₂ is:

A. 1 mole
B. 2 moles ✓
C. 4 moles
D. 0.5 moles
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Jun 23, 2026

Improving laboratory techniques, such as ensuring complete transfer of materials, is done to increase the:

A. Theoretical yield
B. Actual yield ✓
C. Rate of reaction
D. Activation energy
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Jun 23, 2026
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