If you are runnning the following chemical reaction: 4NH3 + 5O2 > 4NO + 6H2O. If I want to make 18.0grams of water, how much NH3 do I need?

Question

Need help quick!!!! I don’t know what I’m doing!!!!!!!!!!!

Answer 1

4NH3 + 5O2 > 4NO + 6H2O. Balanced equation

This tells you that it takes FOUR moles of NH₃ to make SIX moles of water. You want to make 18.0 grams of water. How many moles is that? 18.0 g x 1 mole/18 g = 1.0 moles of water.

So you want to make ONE mole of water. To find moles NH3 needed, it is 1 mol H2O x 4 mol NH3/6 mol H2O = 0.667 mole NH3

To find grams NH3 needed, it is 0.667 moles x 17g/mole = 11.3 g