va rog repede dau coroana
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Răspuns:
Explicație:
4Al + 3O2= 2Al2 O3
P4 +5 O2= P4O10 [P2 O5 ]
C + O2= CO2
2Ca + O2 =2 CaO
4Na + O2=2 Na2O
Na2O + H2O = 2NaOH
CO2 + H2O⇄ H2CO3
CaO + H2O= Ca(OH)2