Given 3.00 moles of N₂, how many moles of NH₃ would be produced? *

6.00 mol NH₃

Explanation:

N₂  +  3 H₂  ⇆  2 NH₃

This is the reaction that produces NH₃.  Use the mole ratios in the chemical equation to solve.  For every 1 mole of N₂ consumed, 2 moles of NH₃ is produced.

(3.00 mol N₂) × (2 mol NH₃/1 mol N₂) = 6.00 mol NH₃

You will produce 6 moles of NH₃.

if you're asking what comes out, it's steam.