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H3PO4= H1 P5 O-2
NaOH= Na1 O-2 H1
Fe(OH)3= Fe3 O-2 H1
Fe(OH)2= Fe2 O-2 H1
P2O5= O-2 P5
OsO4= O-2 Os8
Cu2O= O-2 Cu1
CuO= Cu2 O-2
HCl= H1 Cl-1
NH3= H1 N-3
CH4= H1 C-4
K2SO3= K1 O-2 S4
K2SO4= K1 O-2 S6
Ca(NO3)2= Ca2 O-2 N5
Al2(SO4)3= Al3 O-2 S6
Ca3(PO4)2= Ca2 P5 O-2