Answer
$-76.885\,kJ$
Work Step by Step
$\Delta E= q+w= +115\,J -77\,kJ$
(Heat is absorbed, therefore the sign of q is +.
Work is done by the system, therefore w is negative.)
$\Delta E= 115\,J- 77000\,J= -76885\,J=-76.885\,kJ$
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