24. The system contains 1.50 mole N2 at 298 K and 1 atm, and is initially at equilibrium. Calculate the change in internal energy when 2.50 kJ of energy is transferred as heat to the system at constant pressure. Assume that N2 behaves as an ideal gas and its heat capacity is mainly contributed by translational and rotational motion but none of vibrational ones. (A) +1.50 kJ (B) +1.79 kJ (C) +1.89 kJ (D) +2.50 kJ (E) None of the above is correct.