Balance the chemical equations: 1) ___ N2O5 → ___ N2 + ___ O2 2) Fe + O2 → Fe2O3 3) H2 + Cl2 → HCl

1) 2, 2, 5
2) 4, 3, 2
3) 1, 1, 2

The answer would be

The activity series is shown in the attached picture. if the element is below the other, then you can displace the other. following the activity series as a guide, the reactions are as follows: nickel and aluminum chloride3 ni + 2 alcl₃  → 3 nicl₂ + 2 albarium and copper bromideba + cubr  →  no reaction because cu is less oxidizable than bapotassium nitrate and aluminum3 kno₃ + al  → al(no₃)₃ + 3 ksodium phosphate and zincnaso₄ + zn  → znso₄ + na