2. Which one is the modal class? a. 3-5
b. 6-8
c. 9-11
d. 15-167
​math po

a.3-5 is the modal class.

how about u try it first

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 .