What does a mole ratio represent in a balanced chemical equation?

The ratio of coefficients of substances

Class 9 Chemistry · Chapter 4 · Test 8

Mole Ratios and Stoichiometry

25 MCQs covering balanced chemical equations, mole ratios, relationships between reactants and products, calculating moles using stoichiometric coefficients, and solving basic chemical reaction problems using mole-to-mole conversions.

MCQs

25 questions · 20 min · 25 marks

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Sample questions

The first 5 of 25. Try each one, then tap to see the answer.

Question 1
What does a mole ratio represent in a balanced chemical equation?
- AThe ratio of atomic masses
- BThe ratio of coefficients of substances
- CThe ratio of temperatures
- DThe ratio of volumes only
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Answer: B
Mole ratios are obtained from the coefficients of substances in a balanced chemical equation.
Question 2
In the equation 2H2 + O2 -> 2H2O what is the mole ratio of hydrogen to oxygen?
- A1:1
- B1:2
- C2:1
- D2:2
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Answer: C
The coefficients show that two moles of hydrogen react with one mole of oxygen.
Question 3
In the equation N2 + 3H2 -> 2NH3 how many moles of hydrogen react with one mole of nitrogen?
- A1 mol
- B2 mol
- C3 mol
- D4 mol
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Answer: C
The coefficient of hydrogen is 3 while the coefficient of nitrogen is 1.
Question 4
In the equation 2Mg + O2 -> 2MgO how many moles of magnesium oxide form from two moles of magnesium?
- A1 mol
- B2 mol
- C3 mol
- D4 mol
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Answer: B
The balanced equation shows a one-to-one mole ratio between magnesium and magnesium oxide.
Question 5
In the equation CH4 + 2O2 -> CO2 + 2H2O how many moles of water form from one mole of methane?
- A1 mol
- B2 mol
- C3 mol
- D4 mol
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Answer: B
The coefficient of water is 2 and the coefficient of methane is 1.

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