Chemical energy volumetric source

The chemical energy volumetric source term arising from the five reactions depends on the associated heats of reaction, in the energy equation and is given by. 

Sources From L. Lepori and E. Matteoli, 1998, Excess Volumes of the Ternary System Ethanol + Tetrahydrofuran + Cyclohexane at 298.15 K, Fluid Phase Equilibria, 145, 69 G. Conti, P. Gianni, L. Lepori, and E. Matteoli, 2003, Volumetric Study of (2-Methoxyethanol + Tetrahydrofuran + Cyclohexane) at 298.15 K, Journal of Chemical Thermodynamics, 35, 503 P. Gianni. L. Lepori, and E. Matteoli, 2010, Excess Gibbs Energies and Volumes of the Ternary System Chloroform + Tetrahydrofuran + Cyclohexane at 298.15 K, Fluid Phase Equilibria, 297, 52. 

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