What is the mole ratio of hydrogen gas to oxygen gas required to react completely to form water: 2H2 + O2 -> 2H2O?
Answer and explanation
Correct answer: B. 2 moles of H2 to 1 mole of O2
- Step 1: The balanced equation 2H2 + O2 -> 2H2O indicates that 2 molecules (or moles) of H2 react with 1 molecule (or mole) of O2. Step 2. The mole ratio is 2 : 1. Answer: 2 moles of H2 to 1 mole of O2. Why not the others: Reacting in equal amounts would leave excess oxygen unreacted.
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