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Gases Avogadro's Law and Molar Mass

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Equal 1 L samples of O₂, H₂, Cl₂ and H₂O vapour are compared at the same temperature and pressure. Which has the greatest mass?

Verified Answer & Explanation⌄

Correct Answer: C) Cl₂

Concept Explanation

Equal gas volumes at the same T and P contain equal moles. Mass therefore depends on molar mass, and Cl₂ has the highest molar mass.

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