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Question

How many grams of O₂ are required to produce 44 g of CO₂ by burning carbon, if only 80% of the oxygen reacts? (Atomic masses: C = 12, O = 16)

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Explanation

Reaction: C + O₂ → CO₂. Moles of CO₂ = 1 mol; requires 1 mol O₂ (32 g). Since 80% reacts, total O₂ = 32 / 0.8 = 40 g.

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