The standard enthalpy of formation of a compound is the change of enthalpy during the formation of 1 mole of the substance from its constituent elements, with all substances in their standard states.
Example: C(s, graphite) + O2(g) → CO2(g)
The standard enthalpy of formation of CO2(g) can be determined as the enthalpy of combustion of graphite and measured using bomb calorimeter.
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Carbon gets exchanged between lithosphere, hydrogen and atmosphere of earth explain with diagram.
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Small but useful and accurate answer. goood
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