Chemistry · THERMODYNAMICS

Which of the following conditions represents the exact state where \( \Delta H = \Delta U \) for a chemical reaction involving gases?

1. A
   The reaction is conducted at extremely high pressures so that ideal behavior is severely departed from.
2. B
   The reaction occurs in an open vessel at constant external atmospheric pressure.
3. C
   The reaction is highly exothermic such that \( q_p < 0 \).
4. D
   The difference between the number of moles of gaseous products and gaseous reactants (\( \Delta n_g \)) is identically zero.