Question

1 How many 0.50 mole (a) moles of ammonia will be formed from and 1.5 moles of H2 and N2 0.5 mol (6) 1.5 mol (c) 2.0 mol (d) 1.0 mol​

Answer 1

Answer:

First you write the equation for formation of ammonia from hydrogen and nitrogen:

N2 + 3H2 → 2NH3

Note that nitrogen and hydrogen react in the ratio 1:3. The reactants that you have are in the ratio 1:2. Thus you have more nitrogen than you need to react with the hydrogen that you have - nitrogen is in excess (or, you don’t have enough hydrogen to react with all your nitrogen). You then write a balanced equation using the actual moles of the reagent that isn’t in excess (hydrogen):

2N2 + 6H2 → 4NH3

And you can see that you will form 4 moles of ammonia. You will also have one mole of nitrogen left over as you only needed 2 moles to react with your hydrogen.