Balanceo por tanteo

____________________ HCl + Zn - - - > ZnCl2 + H2

____________________ KClO3 - - - > ____________________ O2 + ____________________ KCl

ZnS + ____________________ HCl - - - > ZnCl2 + H2S

N2 + ____________________ H2 - - - > ____________________ NH3

P4 + ____________________ O2 - - - > ____________________ P2O 3