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9.7: Key Equations

Last updated

Aug 6, 2023
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- 9.6: Key Terms
- 9.8: Summary

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$q = c \times m \times Δ T = c \times m \times (T_{final} - T_{initial})$

$Δ U = q + w$

$Δ H_{reaction} ° = \sum n \times Δ H_{f} ° (products) - \sum n \times Δ H_{f} ° (reactants)$

Bond energy for a diatomic molecule:

$XY (g) ⟶ X (g) + Y (g) D_{X–Y} = Δ H °$

Enthalpy change: ΔH = ƩD_bonds_broken – ƩD_bonds_formed

Lattice energy for a solid MX:

$MX (s) ⟶ M^{n} + (g) + X^{n −} (g) Δ H_{lattice}$

Lattice energy for an ionic crystal:

$Δ H_{lattice} = C (Z^{+}) (Z^{−}) R_{o}$

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