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Stoichiometry Mole–Mass Stoichiometry

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If 2.25 mol O₂ reacts completely with Al, what mass of Al is consumed? 4Al + 3O₂ → 2Al₂O₃

Verified Answer & Explanation⌄

Correct Answer: A) 81 g

Concept Explanation

3 mol O₂ require 4 mol Al. 2.25 mol O₂ require: (4/3) × 2.25 = 3.0 mol Al Mass = 3 × 27 = 81 g.

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