The value of ΔE for a system that performs 139 kJ of work on its surroundings and gains 54kJ of heat is ________ kJ.
A)-85
B)193
C)7506
D)85
E)-193

Question

Quizplus · Accepted Answer

The change in internal energy (ΔE) is calculated using the formula ΔE = q + w, where q is the heat gained by the system and w is the work done on the system. Here, q = +54 kJ and w = -139 kJ (since work is done on the surroundings). Thus, ΔE = 54 kJ - 139 kJ = -85 kJ.

The Value of ΔE for a System That Performs 139