(A) The reaction N 2 O 4 (g) 2 NO 2 (g) has r H...

(A) The reaction N₂O₄(g) ⇌ 2 NO₂(g) has Δ_rH° = +57.2 kJ mol^-1. Will the amount of NO₂(g) formed from N₂O₄(g) be greater at high or low temperatures?

(B) The enthalpy of formation of NH₃ is Δ_fH°[NH₃(g)] = -46.11 kJ/mol. Will the concentration of NH₃ in an equilibrium mixture with its elements be greater at 100 or at 300 °C? Explain.