0 0 +4 -2
a) S(s) + O2(g) --> SO2(g) + Q , exoterma , ireversibila
S⁰ __-4e-__> S⁺⁴ oxidare (ag. red. S)
O2⁰ __+4e-__> O2⁻² reducere (ag. ox. O2)
reactie egalata, deoarecce nr e- cedati = nr. electroni acceptati
0 0 -3 +1
b) N2(g) + 3H2(g) <==> 2NH3(g) + Q , exoterma, reversibila
N2⁰ _2x(+3e-)_> 2N⁻³ reducere (ag. Ox. N2)
3H2⁰ _6x(+1e-)_> 2H3⁺ oxidare (ag. Red. H2)
0 0 +2 -2
c) N2(g) + O2(g) -<==> 2NO(g) - Q , endoterma , reversibila
N2⁰ _2x(+3e-)_> 2N⁻³ reducere (ag. Ox. N2)
O2⁰ __2x(+2e-)_> 2O⁻² reducere (ag. ox. O2)