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Thermodynamics — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistryThermodynamics1 Mark
Question
Why is standard enthalpy of formation of diamond not zero although it is an element?
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Answer

It is because diamond is not standard state of element. Standard state of carbon is graphite whose $\Delta_\text{f}\text{H}^\circ=0.$

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