What volume of hydrogen at STP is evolved when 4.6 g of ethanol reacts with excess sodium (C = 12, H = 1, O = 16)?
Correct answer D. 1.12 dm³
Explanation
4.6 g C₂H₅OH is 0.1 mol. 2C₂H₅OH + 2Na → 2C₂H₅ONa + H₂ gives 0.05 mol H₂, and 0.05 × 22.4 = 1.12 dm³.
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