4NH3(g)+3O2(g)→2N2(g)+6H2O(g) How many grams of O2 are needed to react with 5.00 mol of NH3?
The ratio between NH3 and O2 is 4:3, respectively.
So for every four NH3's you have, you gotta to have three O2's.
I dont feel like doing the conversion steps... sooooooo here:
You need 60 grams of O2 to react with 5 moles of NH3.