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Practice Questions

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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nmdcat.online Chemistry NMDCAT MCQs

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

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

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

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

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

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

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

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

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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nmdcat.online Chemistry NMDCAT MCQs

Jun 23, 2026

The actual yield is typically given in units of:

A. Moles

B. Grams (mass) ✓

C. Percentage

D. Liters

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Jun 23, 2026

A reaction that does not go to completion will always have a percent yield that is:

A. 100%

B. Greater than 100%

C. Less than 100% ✓

D. 0%

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Jun 23, 2026

The value of the theoretical yield is independent of:

A. The amount of limiting reactant

B. The coefficients in the balanced equation

C. The efficiency of the laboratory procedure ✓

D. The molar mass of the product

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Jun 23, 2026

The “yield” of a reaction always refers to the amount of:

A. Reactant consumed

B. Product formed ✓

C. Catalyst used

D. Energy released

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Practice Questions

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

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

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

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)

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

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):

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

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

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

The amount of product specified in the calculation is the:

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

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

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

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

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

The actual yield is typically given in units of:

A reaction that does not go to completion will always have a percent yield that is:

The value of the theoretical yield is independent of:

The “yield” of a reaction always refers to the amount of:

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