Solve these Please. (15 points)
Balance the following chemical equations:

1) Fe + O2 → Fe2O3
2) H2 + Cl2 → HCl
3) Ag + H2S → Ag2S + H2
4) CH4 + O2 → CO2 + H2O
5) HgO → Hg + O2
6) Co + H2O → Co2O3 + H2