The following reaction is exothermic at constant pressure
N₂(g) + 3 H₂(g) → 2 NH₃(g)
Which of the following can be said about the reaction?

• A. The reaction is spontaneous at high temperatures but not at low temperatures.
• B. The reaction is spontaneous at low temperatures but not at high temperatures.
• C. The reaction is spontaneous at all temperatures.
• D. The reaction is nonspontaneous at any temperature.
• E. Not enough information is given to answer the question.

Answer: (B)