How much heat would be released by the reaction of 0.95 g of Mg with excess HCl?
回答 (1)
2016-11-16 9:36 am
✔ 最佳答案
Mg(s) + 2HCl (aq) → MgCl₂(aq) + H₂(g) ΔH = -306.9 kJ/molThe reaction of 1 mole of Mg gives off 306.9 kJ of heat.
Molar mass of Mg = 24.3 g/mol
No. of moles of Mg reacted = (0.95 g) / (24.3 g/mol) = 0.0391 mol
Amount of heat released = (306.9 kJ/mol) × (0.0391 mol) = 12 kJ
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