Calculate the change in internal energy (ΔU) for a system that is giving off 45.0 kJ of heat and is performing 855 J of work on the surroundings.

Question

Quizplus · Accepted Answer

The change in internal energy (ΔU) is calculated using the first law of thermodynamics: ΔU = q - w, where q is the heat exchanged and w is the work done. Here, q = -45.0 kJ (since the system is giving off heat) and w = 0.855 kJ (since the system is performing work on the surroundings). Therefore, ΔU = -45.0 kJ - 0.855 kJ = -45.855 kJ, which rounds to -45.9 kJ.

Calculate the Change in Internal Energy (ΔU) for a System