Calculate the value of ΔE in joules for a system that loses 73 J of heat and has 150 J of work performed on it by the surroundings.

Question

Quizplus · Accepted Answer

ΔE = q + w, where ΔE is the change in internal energy of the system, q is the heat transferred to or from the system, and w is the work done on or by the system. In this case, q = -73 J (heat is lost from the system) and w = 150 J (work is done on the system by the surroundings). Therefore, ΔE = -73 J + 150 J = +77 J. The answer is C, +77.

Calculate the Value of ΔE in Joules for a System