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Stoichiometry Molar Mass from Gas Volume

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A 7.5 g sample of a gas occupies 5.6 dm³ at STP (273 K and 1 atm). Its molar mass is:

Verified Answer & Explanation⌄

Correct Answer: B) 30 g mol⁻¹

Concept Explanation

5.6 dm³ at STP = 0.25 mol. Molar mass = 7.5/0.25 = 30 g mol⁻¹.

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