Why standard heat of formation of diamond is not zero though it is an element?
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The standard enthalpy of formation for an element in its standard state is ZERO!!!! Elements in their standard state are not formed, they just are. So, ΔH°f for C (s, graphite) is zero, but the ΔH°f for C (s, diamond) is 2 kJ/mol. That is because graphite is the standard state for carbon, not diamond.
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Because, graphite is the standard state of carbon not the diamond.
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