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CuCl2 H2O 2 H3PO4
3 Ca(OH)2 Ca3(PO4)2 6 H2O
2 Na 2 H2O 2 NaOH
H2 C3H8 5 O2
3 CO2 4 H2O 4 NH3
5 O2 4 NO 6 H2O