When 4 g of H₂ reacts with 16 g of O₂ according to 2H₂ + O₂ → 2H₂O, what mass of water is formed?
Correct answer A. 18 g
Explanation
H₂ = 2 mol and O₂ = 0.5 mol. 2 mol H₂ would need 1 mol O₂, so O₂ is limiting. 0.5 mol O₂ gives 1 mol H₂O = 18 g.
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