The ΔE of a system that absorbs 12.4 J of heat and does 4.2 J of work on the surroundings is ________ J.
A)16.6
B)12.4
C)4.2
D)-16.6
E)8.2

Question

Quizplus · Accepted Answer

The change in internal energy (ΔE) of a system is given by the formula ΔE = q + w, where q is the heat absorbed by the system and w is the work done by the system. If the system does work on the surroundings, the work is considered negative. Therefore, ΔE = 12.4 J + (-4.2 J) = 8.2 J.

The ΔE of a System That Absorbs 12