Standard heat of formation

The standard heat of formation is a kind of heat of reaction. It means the heat gotten rid of or pulled in when 1 mole of a compound is made from elements when its on standard conditions. The sign for standard heat of formation is ΔH°f, where the subscript means formation. The elements make the compound while they are in their stable times. For instance, oxygen would be gas, and iron would be solid during these times.

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Category:Physical chemistry