Classifique as reações em exotérmicas ou endotermicas.?

a) 2H2(g) + 1O2(g) -------------- 2H2O(l) + 136,6 Kcal

b) 4C(grafita) + 1S8(rombico) ---------- 4CS2 (l) - 104,4 Kcal

c) 1H2(g) + 1Cl2(g) -44,2 Kcal ------- 2 HCl(g)

d) 1H2(g) + 1 l2(g) + 12,4 Kcal ------- 2Hl(g)

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