A piece of solid bismuth is burned in excess oxygen?

Question

I need to know how this would be written. I know in the equation I'm adding O2, but do I add it to Bi? or is it Bi2? I have no idea with this one.

And when the reaction is complete, is the product just Co2 and H2O or does it still have traces of bismuth?

Also, how would I write Ammonium gas and excess oxgen gas are mixed in the presence of platinum as a catalyst?

Any answers are greatly appreciated.

(Even from you, Dr. A.)

Answer 1

4Bi & 3 O2 --> 2 Bi2O3  

http://en.wikipedia.org/wiki/Bismuth_oxi...

4NH3 + 5O2 -----> 4NO + 6H2O

(& write the symbol "Pt" on the arrow)