ok.. im confused:

Question

Ammonia and oxygen react in the equation: 4NH³+5O²--> 4NO+6H²O. When 2.4 mol of NH³ are present, the reaction yields ____ mol of O².

i have no clue how ot do this!

Look at your problem to make sure it is posted correctly. NH3 REACTS with O2; it doesn't yield O2.

thats exactly what it says on my homework

That may be why you are confused. I'm sure the problem was meant to ask for number of mols O2 USED when 2.4 mols NH3 are consumed.

Of course, if the problem is stated correctly, then the answer is that the reaction produces zero mols O2.

ok- Thanks!