Take molar volume = 22.4 dm³/mol. What volume of hydrogen at STP is produced when 0.20 mol of ethanol reacts with excess sodium?
Correct answer C. 2.24 dm³
Explanation
2C₂H₅OH + 2Na → 2C₂H₅ONa + H₂. Two moles of ethanol give one mole of H₂, so 0.20 mol gives 0.10 mol H₂. Volume = 0.10 × 22.4 = 2.24 dm³.
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