What is the pH of a 3.67 × 10-5 M NaBr solution?

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 .

your answer is a. the enthalpy of formation for a pure element in its standard state is always positive.