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Stoichiometry Gas Volume and Mole Concept

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Air contains approximately 21% O₂ by volume. How many moles of O₂ are present in 10 L air at STP (273 K and 1 atm)?

Verified Answer & Explanation⌄

Correct Answer: D) 0.094 mol

Concept Explanation

Volume of O₂ = 0.21 × 10 = 2.1 L. Moles = 2.1/22.4 ≈ 0.094 mol.

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