What amount of ammonia, NH3 (g), can be produced from 15 mol of hydrogen reacting with excess nitrogen?

3 H2 (g) + N2 (g) → 2NH3 (g)

10mol

Explanation:

3H2 + N2 - > 2NH3

Stoichiometry is a tool that chemists can use to find the amount of substance present in any part of a reaction. The arrow (->) suggests that the reaction goes to completion (100%), so assume that left side = right side.

3H2

15 mol

You can divide the amount of moles by the coefficient to find the number of moles when you have a coefficient of 1. This number can then be used to find the value of moles for the rest of the products/reactants:

15/3=5mol

NH3 has a coefficient of 2, so we have to multiply the value we got (5mol) by 2. This results in having 10mol of ammonia as the end result.