3) Classifique as reações

I. C2H2(g) + 2,5 O2(g) → 2 CO2(g) + H2O(l) + 78 kJ/mol
II. 2 C(s) + H2(g) → C2H2(g) ΔH = +54,2 kcal/mol
III. H2(g) + 0,5 O2(g) – 68,3 kcal/mol → H2O(l)
IV. C(s) + O2(g) → CO2(g) –94,1 kcal/mol
a) Classifique as reações.
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