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Thermochemistry & Thermodynamics

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Thermochemistry & Thermodynamics

Thermochemical Equation

A balanced chemical equation that also states the enthalpy change for the amounts shown.

aA + bB → cC, ΔH = x kJ kJ/mol Thermochemistry & Thermodynamics

Thermodynamic Equilibrium

The state in which a system's properties no longer change with time and all driving forces are balanced.

ΔG = 0 kJ/mol Thermochemistry & Thermodynamics

Thermodynamics

The branch of science dealing with energy, its transformations, and the direction in which processes occur.

J Thermochemistry & Thermodynamics

Third Law of Thermodynamics

The entropy of a perfect crystalline substance approaches zero as the temperature approaches absolute zero.

S → 0 as T → 0 K J/(mol·K) Thermochemistry & Thermodynamics

Trouton's Rule

The empirical observation that the entropy of vaporisation of many liquids is close to 88 J/(mol·K) at their boiling point.

ΔS_vap = ΔH_vap / T_b ≈ 88 J/(mol·K)