Mole ratios Knowledge-Based Practice

Chemistry · The Mole & Stoichiometry · Chemistry · Stoichiometry

4 Chemistry practice questions on Mole ratios. Questions that assess core concepts and understanding.

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Questions

1.
According to the balanced chemical equation $2\mathrm{C}_2\mathrm{H}_6(g) + 7\mathrm{O}_2(g) \rightarrow 4\mathrm{CO}_2(g) + 6\mathrm{H}_2\mathrm{O}(g)$ , what is the mole ratio of carbon dioxide ( $\mathrm{CO}_2$ ) produced to oxygen gas ( $\mathrm{O}_2$ ) consumed?
- A) 7 : 4
- B) 2 : 7
- C) 4 : 7
- D) 4 : 6
2.
According to the balanced equation $2\mathrm{KClO}_3(s) \rightarrow 2\mathrm{KCl}(s) + 3\mathrm{O}_2(g)$ , how many moles of $\mathrm{KClO}_3$ are required to produce 0.75 moles of $\mathrm{O}_2$ ?
- A) 0.50 mol
- B) 0.75 mol
- C) 1.1 mol
- D) 2.25 mol
3.
According to the balanced chemical equation $\mathrm{N}_2(g) + 3\mathrm{H}_2(g) \rightarrow 2\mathrm{NH}_3(g)$ , how many moles of hydrogen gas ( $\mathrm{H}_2$ ) are required to produce 5.0 moles of ammonia ( $\mathrm{NH}_3$ )?
- A) 3.3 moles
- B) 7.5 moles
- C) 10.0 moles
- D) 15.0 moles
4.
According to the balanced chemical equation $\mathrm{C}_3\mathrm{H}_8(g) + 5\mathrm{O}_2(g) \rightarrow 3\mathrm{CO}_2(g) + 4\mathrm{H}_2\mathrm{O}(g)$ , how many moles of $\mathrm{H}_2\mathrm{O}$ are produced by the complete combustion of 2.5 moles of $\mathrm{C}_3\mathrm{H}_8$ ?
- A) 2.5 moles
- B) 7.5 moles
- C) 10 moles
- D) 12.5 moles

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