0.64 g of a gas occupies 224 cm³ at STP. What is its molar mass?
Correct answer B. 64 g mol⁻¹
Explanation
224 cm³ is 0.224 dm³, which is 0.224 ÷ 22.4 = 0.010 mol at STP. Molar mass = 0.64 g ÷ 0.010 mol = 64 g mol⁻¹.
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