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Calculating Enthalpy of Reaction by a Matrix Method

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Mutasim I. Khalil

Chemistry Department, King Saud University College of Science, Riyadh 11451, Saudi Arabia

J. Chem. Educ., 2000, 77 (2), p 185

DOI: 10.1021/ed077p185

Publication Date (Web): February 1, 2000

Section:

History, Education, and Documentation

Abstract

A matrix representation method is suggested to calculate for the enthalpies of chemical reactions from given thermochemical equations using the relation ns = n_net, where n, s, and n_net represent the stoichiometric number matrices of the given reactions, the path matrix, and the stoichiometric number matrix of the equation to be solved. The path s, which shows the number of times that these given equations occur to give the net reaction, is calculated by inspection or by a computer program. Multiplying the path matrix s by the columns matrix of D_rH° given would yield the net heat change.