What volume of hydrogen at STP is released when 2.4 g of magnesium reacts completely with steam (Mg = 24)?
Correct answer D. 2.24 dm³
Explanation
2.4 g Mg is 0.1 mol. Mg + H₂O → MgO + H₂ gives 0.1 mol H₂, and 0.1 × 22.4 dm³ = 2.24 dm³ at STP.
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