In which reaction would you expect \Delta H to be substantially greater than \Delta U (i.e., \Delta H > \Delta U)?
Select one:
A. H₂O(s) -> H₂O(l)
B. H₂(g) + Br₂(g) -> 2HBr(g)
C. HCl(aq) + NaOH(aq) -> NaCl(aq) + H₂O(l)
D. CO₂(s) -> CO₂(g)
E. C₂H₂(g) + H2(g) -> C₂H₄(g)