The ΔE of a system that releases 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

Name: The ΔE of a system that releases 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
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Question

Quizplus · Accepted Answer

The ΔE of the system is equal to the sum of the heat released and the work done on the surroundings, but the sign is negative because the system is losing energy. Therefore, ΔE = -(12.4 J + 4.2 J) = -16.6 J.

The ΔE of a System That Releases 12