5H₂ 1. What number represents the coefficient?
2. What number represents the subscript?
3. What element is represented by the letter H?
4. How many total H’s are there?

1 H

Explanation:

In chemistry , the chart shows that there is only on Hydrogen ( representing H) therefore the coefficient says two hydrogen and is possible that two hydrogens are used in the formulary for a specific reason

the reaction mixture contains some ammonia, plus a lot of unreacted nitrogen and hydrogen. the mixture is cooled and compressed, causing the ammonia gas to condense into a liquid. the liquefied ammonia is separated and removed. the unreacted nitrogen and hydrogen are then recycled back into the reactor .