The change in the internal energy of a system that absorbs 2,500 J of heat and that does 7,655 J of work on the surroundings is ________ J. A)10,155 B)5,155 C)-5,155 D)-10,155 E)1.91 × 10⁷

Question

Quizplus · Accepted Answer

The change in internal energy can be calculated using the First Law of Thermodynamics, which states that the change in internal energy (ΔU) of a system is equal to the heat (q) added to the system minus the work (w) done by the system on the surroundings.

ΔU = q - w
ΔU = 2,500 J - 7,655 J
ΔU = -5,155 J

Therefore, the change in internal energy is -5,155 J, meaning that the system lost energy to the surroundings. The answer is choice (C).

The Change in the Internal Energy of a System That