7.
2Ca + O2 → 2CaO
CaO + H2O → Ca(OH)2
CaO + 2HCl → CaCl2 + H2O
Ca(OH)2 + 2HCl → CaCl2 + 2H2O
8.
4P + 5O2 → 2P2O5
P2O5 + 3H2O → 2H3PO4
H3PO4 + 3NaOH → Na3PO4 + 3H2O
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Answers & Comments
7.
2Ca + O2 → 2CaO
CaO + H2O → Ca(OH)2
CaO + 2HCl → CaCl2 + H2O
Ca(OH)2 + 2HCl → CaCl2 + 2H2O
8.
4P + 5O2 → 2P2O5
P2O5 + 3H2O → 2H3PO4
H3PO4 + 3NaOH → Na3PO4 + 3H2O