ChemistryChemical combinationJAMB
In the reaction 2H₂(g) + O₂(g) → 2H₂O(l), what volume of oxygen reacts completely with 20 cm³ of hydrogen at the same temperature and pressure?
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Answer: D. 10 cm³
Gay-Lussac's law: the volume ratio H₂ : O₂ = 2 : 1, so 20 cm³ of H₂ needs 10 cm³ of O₂.
An AdmitMe practice question, written for the JAMB syllabus. Not an official past question.