a) 2Ca + O2 => 2CaO
CaO + H2O => Ca(OH)2
б) 4P + 5O2 => 2P2O5
P2O5 + 3H2O => 2H3PO4
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a) 2Ca + O2 => 2CaO
CaO + H2O => Ca(OH)2
б) 4P + 5O2 => 2P2O5
P2O5 + 3H2O => 2H3PO4