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Which Of The Following Reactions Represents An Exothermic Reaction

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Which of the following reactions represents an exothermic reaction?

NH3(g) + 12.0 kcal → ½N2(g) + 3/2H2(g)CH4 + 2O2 → CO2 + 2H2O + 212,800 calC + 2S → CS2, ΔH = 27,550 calC(graphite) → C(diamond), ΔH = 0.45 kcal2H2O → 2H2 + O2, ΔH = +58 kcal

 

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