Which of the following reactions represents an exothermic reaction?
A. NH3 (g) + 12.0 kcal → ½N2 (g) + 3/2H2 (g)
B. CH4 + 2O2 → CO2 + 2H2O + 212,800 cal
C. C + 2S → CS2, ΔH = 27,550 cal
D. C (graphite) → C (diamond), ΔH = 0.45 kcal
E. 2H2O → 2H2 + O2, ΔH = + 58 kcal
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