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Modern Thermodynamics for Chemists and Biochemists$
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Dennis Sherwood and Paul Dalby

Print publication date: 2018

Print ISBN-13: 9780198782957

Published to Oxford Scholarship Online: August 2018

DOI: 10.1093/oso/9780198782957.001.0001

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Enthalpy and thermochemistry

Enthalpy and thermochemistry

Chapter:
(p.146) 6 Enthalpy and thermochemistry
Source:
Modern Thermodynamics for Chemists and Biochemists
Author(s):

Dennis Sherwood

Paul Dalby

Publisher:
Oxford University Press
DOI:10.1093/oso/9780198782957.003.0006

Definition and mathematics of enthalpy. Definition of heat capacity at constant pressure as CP = (∂H/∂T)V. Endothermic and exothermic reactions. Role of the change in enthalpy as regards the direction and spontaneity of a change in state. Enthalpy changes and phase changes. Measuring enthalpy changes by calorimetry. Hess’s law of constant heat formation. Chemical standards and standard states. Standard enthalpies of formation, ionic enthalpies and bond energies. How the change in enthalpy varies with temperature. Kirchhoff’s equations. Applications of thermochemistry to a variety of worked examples, including flames and explosions.

Keywords:   enthalpy, heat capacity at constant pressure, thermochemistry, endothermic, exothermic, directionality, spontaneity, phase change, Hess’s law of constant heat formation, chemical standards, standard state, enthalpy of formation, ionic enthalpy, bond energy, Kirchhoff’s equations

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