In the reaction above, what is the limiting reagent if 2.0 moles of H2 reacts with 2.0 moles of N2 ?

Answer 1

You didn't provide "the reaction above", but I'll assume it is

3H₂ + N₂ ==> 2NH₃

The easiest way to find the limiting reactant is to divide the moles of each reactant by its coefficient in the balanced equation:

For H₂: 2.0 moles H₂ / 3 = 0.67

For N₂: 2.0 moles N₂ / 1 = 2.0

Thus, H2 is the limiting reagent