What are three conditions for making ammonia?

Answer 1

450 degrees celcius at 150 atmospheres of pressure, plus an iron catalyst to speed up the reaction.

These conditions are used becauase they produce the optimum amount of yield of ammonia at the cheapest rate.

Answer 2

Three conditions for making ammonia are: high pressure, which increases the rate of reaction, a catalyst such as iron or ruthenium to speed up the reaction, and a specific temperature range of 400-500 degrees Celsius for optimal yield.