Question

Calculate W for a system that absorbs 260kJ of heat and for which total change in internal energy is 157kJ. Is the work done on the system or by the system?does the system expand or contract?

Answer 1

Answer:

When a system does work on the surroundings, the system's internal energy decreases. When a system has work done on it, the internal energy of the system increases. Like heat, the energy change from work always occurs as part of a process: a system can do work, but doesn't contain work.