U.S. GRADE & SUBJECT QUESTION BANKS
Grade 10 science.
2 skills. Questions, hints and worked examples.
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Worked example
For 2H₂ + O₂ → 2H₂O, what amount of O₂ is required for 4 mol H₂, assuming the reaction follows this ratio?
Answer & why
Answer: 2 mol
The H₂:O₂ ratio is 2:1, so 4 mol H₂ requires 2 mol O₂.