4 Al + 3 O₂ → 2 Al₂O₃
4 P + 5 O₂ → 2 P₂O₅
2 Ca + O₂ → 2 CaO
2 Na + 2 HCl → 2 NaCl + H₂
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4 Al + 3 O₂ → 2 Al₂O₃
4 P + 5 O₂ → 2 P₂O₅
2 Ca + O₂ → 2 CaO
2 Na + 2 HCl → 2 NaCl + H₂