Question

balancing redox equation SO4^2- + NH3 to SO3^2- +h2o +n2

Answer 1

\(\Large \sf SO _{4}^{2-} ~ + ~ NH _{3} ~ \to ~ SO_{3}^{2-}~+ ~ H _{2}O ~ + ~ N _{2}\)
1) Give oxidation number and find out what atoms that change in oxidation number.
2) Ensure that the oxidation numbers gets equal (the amount of electrons is correct).
3) Balanced the electric charge by \(\sf \large H^{+}\) if acid solution, \(\sf \large OH^{-}\) if basic solution.
4) Balance with water.
5) Check of the equation balanced correctly.

If doing this correctly you almost can't get it wrong, and if you are having problems feel free to ask.

Good luck.