Calculate ΔE of a gas for a process in which the gas absorbs 25 J of heat and does 7 J of work by expanding.

Name: Calculate ΔE of a gas for a process in which the gas absorbs 25 J of heat and does 7 J of work by expanding.
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Question

Quizplus · Accepted Answer

ΔE = q - w
ΔE = 25 J - (-7 J)  [work done by the system is negative]
ΔE = 25 J + 7 J
ΔE = 32 J
The gas absorbs 25 J of heat and does a positive work of 7 J, so the internal energy of the gas increases by 32 J. Therefore, the correct answer is option C.

Calculate ΔE of a Gas for a Process in Which