What is the standard enthalpy of formation of graphite?

Answer

To determine the standard enthalpy of formation of graphite, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Definition**:
- The standard enthalpy of formation (ΔH_f°) is defined as the enthalpy change when one mole of a substance is formed from its constituent elements in their standard states.

2. **Identify the Substance**:
- In this case, we are looking for the standard enthalpy of formation of graphite, which is a form of carbon.

3. **Recognize the Nature of Graphite**:
- Graphite is a naturally occurring form of carbon. It is not produced through a chemical reaction but exists in nature.

4. **Apply the Rule for Naturally Occurring Elements**:
- For any naturally occurring element in its standard state, the standard enthalpy of formation is defined to be zero. This is because no energy is required to form the element from itself.

5. **Conclude the Answer**:
- Therefore, the standard enthalpy of formation of graphite is:
\[ \Delta H_f° \text{ (graphite)} = 0 \, \text{kJ/mol} \]

### Final Answer:
The standard enthalpy of formation of graphite is 0 kJ/mol.

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