According to the text, what did high temperatures thermodynamically favor in the synthesis reaction?

Answer

The reverse reaction, breaking ammonia back down into nitrogen and hydrogen

While high temperatures increased the reaction speed, they thermodynamically favored the decomposition of ammonia ($ ext{NH}_3$) back into its constituent gases, posing a major hurdle for achieving a useful yield.

According to the text, what did high temperatures thermodynamically favor in the synthesis reaction?
inventionwaterremovalprocessNitrogen