Answer
$Q=12\ kJ$
Work Step by Step
For the isothermal system ($\Delta U=0$), the energy balance reduces to:
$Q-W_{sh}-W_b=0$
Since $W_b=15\ kJ, W_{sh}=-3\ kJ$
$Q=12\ kJ$
Thermodynamics: An Engineering Approach 8th Edition
by Cengel, Yunus; Boles, Michael
Published by
McGraw-Hill Education
ISBN 10:
0-07339-817-9
ISBN 13:
978-0-07339-817-4
Chapter 4 - Energy Analysis of Closed Systems - Problems - Page 203: 4-78
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