Heat in the amount of 7.5 kJ is added to a closed system while its internal energy

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Heat in the amount of 7.5 kJ is added to a closed system while its internal energy decreases by 12 kJ. How much energy is transferred as work? For a process causing the same change of state but for which the work is zero, how much heat is transferred?
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Introduction to Chemical Engineering Thermodynamics

ISBN: 978-0071247085

7th edition

Authors: J. M. Smith, H. C. Van Ness, M. M. Abbott

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