heat of reaction

noun

1. chem the heat evolved or absorbed when one mole of a product is formed at constant pressure

Example Sentences

All properties of any system, including the heat of reaction, are expressible in terms of its available energy A, equal to E − Tϕ + ϕ0T.

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K; thus, when the reaction is spontaneous without requiring external work, the heat absorbed per molecule of reaction is −T� d   δA0 , or −R′T� d log K. dT T dT This formula has been utilized by van ’t Hoff to determine, in terms of the heat of reaction, the displacement of equilibrium in various systems arising from change of temperature; for K, equal to N1n1N2n2 ..., is the reaction-parameter through which alone the temperature affects the law of chemical equilibrium in dilute systems.

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It will be noticed that when dE/dT is zero, that is, when the electromotive force of the cell does not change with temperature, the electromotive force is measured by the heat of reaction per unit of electrochemical change.

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It decomposes water very vigorously, the heat of reaction being sufficient to ignite the hydrogen evolved.

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This is always understood to be the case in equations where the heat of reaction is given.

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