The initial internal energy of a system is 43.5 kJ.It absorbs 8.3 kJ of heat while performing 3.5 kJ of work on the surroundings.What is its final internal energy?

Question

Quizplus · Accepted Answer

The final internal energy is calculated using the first law of thermodynamics, which states that the change in internal energy (ΔU) of a system is equal to the heat added to the system (Q) minus the work done by the system on its surroundings (W). Thus, ΔU = Q - W. Here, Q = 8.3 kJ (heat absorbed) and W = 3.5 kJ (work done by the system), so ΔU = 8.3 kJ - 3.5 kJ = 4.8 kJ. The final internal energy is the initial internal energy plus the change in internal energy, which is 43.5 kJ + 4.8 kJ = 48.3 kJ.

The Initial Internal Energy of a System Is 43