bonjour
pouvez vous m'aider svp
Parfois il n’y a aucun chiffre à noter, le chiffre 1 est sous-entendu!
1 ........C + O2 --------- .........CO
2 .........CH4 + ...... O2 ---------- ........CO2 + ......... H2O
3 ......... Fe2O3 + ...... Al ----------- ......... Fe + Al2O3
4 ....... Cu2+ + ...........HO ------------ Cu (OH)2
5 ...... Fe + ...... H+ ------------ ...... Fe2+ + ....... H2
merci
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