Please someone answer this question

Question

An excess of hydrogen gas reacts with 42.5 g of nitrogen gas. What volume (in liters) of ammonia is produced at STP?

3H₂   + N₂   →   2NH₃

unit:

Answer 1

At STP 1 mole of any ideal gas equals 22.4 liters in volume (memorize this number)

3H₂ + N₂ ==> 2NH₃ ... balanced equation

42.5 g N₂ x 1 mol N₂ / 28 g = 1.52 moles N₂ gas

1.52 mols N₂ x 2 mols NH₃ / 1 mol N₂ = 3.04 mols NH₃ produced

3.04 mols NH₃ x 22.4 L / mole = 68.1 L NH₃ produced