![]() ![]() The standard enthalpy of formation is simply the enthalpy of formation with standard conditions as the specified state. ![]() Having defined a universal reference state, we can discuss a new term called standard enthalpy of formation. This reference state corresponds to 25☌ (77☏) and 10⁵ Pa = 1 bar. In processes involving chemical energy changes, all substances must have the same reference state to be able to use the enthalpy of formation consistently. In other words, it represents the energy required to take that substance to a specified state. We can define the enthalpy of formation as the enthalpy of a substance at a specified state due to its chemical composition. This calculator uses the enthalpy of formation of the compounds to calculate the enthalpy change from a reaction scheme.
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