Ammonia is produced from a reaction as shown in the equation H2(g) + 3N2(g) 2NH3(g). The number of moles of hydrogen required to produce 12 moles of ammonia is

Answer 1

Kinza,

I think you typed the equation incorrectly...

It should be N₂ (g) + 3 H₂ (g)→ 2 NH₃ (g)

Remembering how to interpret the balanced chemical equation, this equation is saying:

1 mole of nitrogen gas reacts with 3 moles oh hydrogen gas to produce 2 moles of ammonia gas.

We can set up ratios/relationships from a balanced equation between any reaction/product

In this case for every 2 moles of ammonia, 3 moles of hydrogen is needed.

Since the question asked how many moles of hydrogen is required to produce 12 moles of ammonia, the relationship/ratio to be used is 3 mol H₂/ 2 mol NH₃

Beginning with what is given 12 mol NH₃ x [3 mol H₂/ 2 mol NH₃] gives the answer 18 mol H₂

This question is actually really simple and the concept shared above is what would be used for more complex problems.