Consider the reaction: N2 + 3H2 → 2NH3 carried out at constant temperature and pressure. If ΔH and ΔU are the enthalpy and internal energy changes for the reaction, which of the following expressions is true?
(a) ΔH = 0
(b) ΔH = ΔU
(c) ΔH < ΔU
(d) ΔH > ΔU
