What are the coefficients needed to balance the following equation?

Question

MnO2 + NH4 --------> Mn2O3 + NH3 + H2O.

Answer 1

Several things are missing here.

"NH4" does not exist; it should be "NH4^+"

MnO2 is being reduced to Mn2O3, but nothing is being oxidised. The conversion of NH4+ to NH3 is part of an acid-base reaction, not oxidation-reduction.

So you will never be able to balance the equation with these materials.

Answer 2

I think your problem on this one is that "NH4" is not a compound. It is cation with a positive one charge, NH4+, called ammonium. Check and see if you copied the problem correctly.