Balancing equations help?

Question

I've been working on this problem for a bajillion hours, yet it still continues to boggle me.

NH3 + HNO3 --> N2 + H2O

Also, what is H3BO3 called?

Thanks =)

Answer 1

5 NH3 + 3 HNO3 -> 4 N2 + 9 H2O

I have no idea about the name for that compound though, sorry. :(

Answer 2

Boric Acid or orthoboric.

5 NH3 + 3 HNO3 = 4 N2 + 9 H2O

Answer 3

This is a redox equation, so either you slug it out or break it into half rxns.  Nitrogen is oxidized from the -3 to 0 level by nitrogen in the +5 oxidation state which is reduced to the 0 level.  

To slug it out, you need enough Hydrogen to make the ratio to oxygen of 2 to 1.   So try

5NH3 + 3HNO3->  4N2+ 9H2O

H3BO3 (better as structure B(OH)3 ) is boric acid.