
11000 is wrong.
My work:

Hint: System does work on surroundings, so it loses. Wording can be tricky in these questions.
What is the correct answer then?
Since heat energy add to the system, hence q = 5100 J
Since work done on the surrounding it means W = - 5900 J
We know ∆E = q + w = 5100 J - 5900 J = -800 J
11000 is wrong. My work: Hint: System does work on surroundings, so it loses. Wording can...
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