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Stoichiometry Molar Mass of Gas Mixtures

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An equimolar gaseous mixture of CH₄ and C₂H₆ occupies 22.4 dm³ at STP. What is its mass?

Verified Answer & Explanation⌄

Correct Answer: D) 23 g

Concept Explanation

Average molar mass: (16 + 30)/2 = 23 g mol⁻¹. 22.4 dm³ at STP = 1 mol mixture. Therefore, mass = 23 g.

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