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Why standard heat of formation of diamon...

Why standard heat of formation of diamond is not zero though it is an element ?

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### Step-by-Step Solution: 1. **Understanding Standard Heat of Formation**: The standard heat of formation (ΔH_f°) of a substance is defined as the change in enthalpy when one mole of the substance is formed from its constituent pure elements in their standard states. 2. **Identifying the Element**: In this case, we are considering diamond, which is a form of carbon. Carbon exists in different allotropes, including graphite and diamond. ...
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