[Jasso66]

My chemistry textbook does not handle this topic well. So I hope someone here can help me a little bit

 N₂ + H₂ ----> NH₃
After the reaction there is n(N₂)=2mol  n(H₂)=2mol n(NH₃)=2mol   

Question: What are the ratios of the amount of substances before the reaction?

Answer: n(N₂)=3mol      n(H₂)=5mol             

I appreciate a lot if someone could explain verbally how to proceed when doing this kind of exercise     

[Astrokel]

Just a few points to note,

1) The reaction is in equilibrium.
2) Chemical equation is not balanced.
3) Work with ICE table for equilibrium reactions.

[Jasso66]

Is this enough?


  N₂ + 3H₂   ---->  2NH₃

[Astrokel]

Correct. Use a reversible arrow to represent equilibrium reaction.

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