What Is a Thermochemical Equation?


Quick Answer

A thermochemical equation is a balanced equation that takes into account the heat flow of a reaction. The heat flow is commonly presented in kilojoules and appears immediately to the right of the equation.

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What Is a Thermochemical Equation?
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Full Answer

Obtained from heat of formation tables, this heat flow, or enthalpy change, is represented by the symbol ΔH. Heat of formation tables apply a standard temperature of 25 degrees C in their enthalpy calculations. Since enthalpy is directly proportional to mass, doubling the coefficients of a thermochemical equation also doubles the resulting heat flow. If the heat flow figure is in the negative, it is indicative of a chemical reaction that gives off energy. A positive figure indicates that it absorbs energy.

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