How many mol of nitrogen (N) are needed to produce 3.00 mol of ammonia?

Question

N2+3H2→2NH3

How many mol of nitrogen (N) are needed to produce 3.00 mol of ammonia?

Answer 1

The Stoichiometric ratio between N2 and NH3 is 1:2, which means that 1 mol of N2 will produce 2 mol of NH3.

If you have 3.00 mol of NH3 produced, there are 3.00*(1/2) = 1.50 mol of N2 participated in the reaction.

For nitrogen atom (N), since N2 -> 2N and you have 1.50 mol N2, then then there are 2*1.50 = 3.00 mol of N needed for reaction.

Hope this answers your question.