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The enthalpy of sublimation of a substance must be = to the sum of the enthalpies of fusion and vaporization, "provided that they are measured at the same temperature". Regarding the temperature part of this statement, does that mean all enthalpies are at the same temperature? or what's the temperature's role?
Yes, given that the enthalpies are organized into a table, this means that these values must be given at a specific temperature. Hence, we can assume that the reactions will be paired with enthalpies at 25 degrees Celsius.
The temperature part refers to the fact that the enthalpy of sublimation of a substance can only equal the sum of the enthalpies of fusion and vaporization when these two values are measured at the same temperature. Temperature is important to take into account because substances tend to have different enthalpies at different temperatures.
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