It is necessary to specify the phases of the reactants and products in a thermochemical equation.
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Explanation:
Incidentally, as you can see, enthalpy and other thermodynamic changes depend a great deal on the phases of the reactants and products in a thermochemical equation. Therefore, it is imperative that the phases always be carefully specified when you are writing thermochemical equations.
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It is important to include the physical states of the reactants and products in a thermochemical equation, because the value of ΔH depends on those states. Endothermic reactions absorb energy from the surroundings as the reaction occurs.
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