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Thermochemistry Study Guide (page 3)

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Updated on Sep 24, 2011

Free energy

Free energy (G) of a system relates the enthalpy (H), temperature in Kelvin (T), and entropy (S) of a system. A negative ΔG means the process is spontaneous, and a positive ΔG means the process is not spontaneous.

ΔG = ΔHTΔS

When is a process spontaneous (i.e., – ΔG)?

    if:
    then:
ΔH + ΔS spontaneous at all temperatures
+ ΔH + ΔS spontaneous at high temperatures
ΔHΔS spontaneous at low temperatures
ΔH + ΔS not spontaneous at any temperature

Practice problems for these concepts can be found at -  Thermochemistry Practice Questions

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