Thermodynamics: An Engineering Approach 8th Edition

Published by McGraw-Hill Education
ISBN 10: 0-07339-817-9
ISBN 13: 978-0-07339-817-4

Chapter 15 - Chemical Reactions - Problems - Page 795: 15-39C

Answer

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Work Step by Step

The heating value is called the higher heating value when the $H_2O$ in the products is in the liquid form and it is called the lower heating value when the $H_2O$ in the products is in the vapor form. The heating value of a fuel is equal to the absolute value of the enthalpy of combustion of that fuel.
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