Which of these did you include in your answer?
The ideal gas model assumes that gas
particles experience no intermolecular
attractions.
5.
O
At low temperature, gas particles move
slowly.
At high pressures, gas particles are very
close together.
The closeness of the gas particles and their
low speed allow intermolecular forces to
become important at high pressure and low
temperature.
The intermolecular forces cause the gas to
deviate from ideal behavior.

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 .

these nuts

the formula mass of a molecule or a compound is the sum of the atomic weights of the atoms in its empirical formula

(that's what i know about formula mass)