At a constant pressure, the following reaction is exothermic: 2NO₂(g)→ N₂O₄(g) Which of the following statements is true about the reaction (as written)?
A. The reaction is always spontaneous.
B. The reaction is spontaneous at low temperatures but not at high temperatures.
C. The reaction is spontaneous at high temperatures but not at low temperatures.
D. The reaction is never spontaneous."
