posted by Sara .
1) Balance this redox reaction using the oxidation-number method. Zn + O2 + HCl ® ZnCl2 + H2O
2) Balance this redox reaction using the half-reaction method. (basic solution) Zn + MnO4- ® Zn(OH)2 + MnO2
Instead of us doing the work for you and you just copying it down, I suggest you try to tell us exactly what you don't understand about the problem and we can go from there. I also suggest you post at the top of the page since this post is WAY down the list.