Can someone help me balance these chemical equations?


____H3BO3 ---> ____H4B6O11


___C3H8 + ___O2 ---> CO2 + ____H2O


____Fe2O3 + ___CO ---> ___Fe + ____CO2

_____H2 + ___ O2 ---> ____H2HO

____PCl5 + ____H2O --> ___HCl + ____H3PO4

____Zn + ____ HCl ---> ____ZnCl2 + ___H2