ajutor, va rog!!!!!!!
![Ajutor Va Rog class=](https://ro-static.z-dn.net/files/d3b/74938d5df50a2b67c9978b6e962389a2.jpg)
Răspuns:
3Fe + 2O2 -> Fe3 O4
2Na + Cl2 -> 2NaCl
1/2SO2 + O2 -> SO3