Standard Heat of Formation

📊 intermediate

$$\Delta H_f^\circ = H_{\text{compound}} - \sum H_{\text{elements}}$$

Enthalpy change when one mole of a compound is formed from its elements in their standard states.

Variables & Units

$\Delta H_f^\circ$

Standard heat of formation

Unit: kJ/mol

Key Information

📐 Derived From

Calorimetry and Hess's Law.

💡 Example

Formation of $CO_2$ from $C$ and $O_2$.

🔧 Applications

Predicting reaction spontaneity.

⚠️ Constraints

$298 K$ and $1 atm$.

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