The phosphonate is deprotonated with a relatively weak base, potassium carbonate. If we were trying to design another experiment and screen bases, what other bases could we try in this reaction (excluding sodium methoxide)?

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 .

the answer is 0.42 is that is an option. this question provides no info