For which of the following reactions, carried out at constant temperature and pressure does ΔU = ΔH?
Note: You may ignore work which is not related to gasses.
a. Fe2O3(s) + 3C(s) → 2Fe(s) + 3CO(g)
b. Ca(OH)2(s) + C2H2(g) → H2O(l) + CaC2(s)
c. 2HCl(g) + Mg(s) → H2(g) + MgCl2(s)
d. Fe2O3(s) + 3Mn(s) → 3MnO(s) + 2Fe(s)
e. O2(g) + 2SO2(g) → 2SO3(g)