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单词 Standard enthalpy change of formation
释义

Standard enthalpy change of formation

英语百科

Standard enthalpy of formation

Standard enthalpy change of formation in Born–Haber diagram for lithium fluoride.

The standard enthalpy of formation or standard heat of formation of a compound is the change of enthalpy during the formation of 1 mole of the compound from its constituent elements, with all substances in their standard states at 1 atmosphere (1 atm or 101.3 kPa). Its symbol is ΔHo
f
or ΔfH. The superscript theta (zero) on this symbol indicates that the process has occurred under standard conditions at the specified temperature (usually 25 °C or 298.15 K). Standard states are as follows:

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