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Enthalpy of elements in 8th standard state are taken as zero and enthalpy of formation of a compound is |
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Answer» HEY there !!! 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. Hope it helps !!! All the best ?!! |
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