## Example 4J.4 in 7th ed textbook

$\Delta G^{\circ}= \Delta H^{\circ} - T \Delta S^{\circ}$

$\Delta G^{\circ}= -RT\ln K$

$\Delta G^{\circ}= \sum \Delta G_{f}^{\circ}(products) - \sum \Delta G_{f}^{\circ}(reactants)$

Harmony Becerra
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### Example 4J.4 in 7th ed textbook

When they solve for delta H, why do they only use Fe2O3 and CO2 in the calculation?

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### Re: Example 4J.4 in 7th ed textbook

The activity of pure solids is defined to be exactly 1.

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