Final answer:
No heat energy was added to or removed from the system in the process, as it is an isolated system and the first law of thermodynamics indicates that no heat exchange occurred.
Step-by-step explanation:
The first law of thermodynamics states that the internal energy of an isolated system is constant if no heat is added or removed from the system. According to the information provided, since the system is isolated and no heat has been exchanged with the surroundings (q = 0), it confirms that there has been no change in the system's internal energy.
Therefore, no heat energy was added to or removed from the system during this process. Also, the provided examples in Figure 15.4 demonstrate that different combinations of heat transfer and work can result in the same change in internal energy (ΔU) of a system, but they do not specifically apply to the question at hand which concerns an isolated system where no heat transfer occurs.