Balance these chemical equations: (Hint: you can only put numbers where the underlines are.)
A) ____Fe + ___O2 ? ___Fe2O3
B) ____N2O ? ____N2 + ____O2
C) ____NaClO3 ? ____NaCl + ____O2
D) ____SiCl4 + ____Mg ? ____Si + ____MgCl2
E) ____C3H8 + ____O2 ? ____CO2 + ____H2O
F) ____ (NH4)3PO4 + ____Pb(NO3)4 ? ____Pb3(PO4)4 + ____NH4NO3