Answer
e) -43 J.
Work Step by Step
The system releases heat, So q is negative. Given w=0.
$\Delta U$= q+w = -43 J + 0 = -43 J.
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.