Gibbs Free energy

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Gibbs Free energy

Postby manasa933 » Tue Feb 06, 2018 11:04 am

In the textbook it says the Gibbs free energy of the solid phase lies the lowest. If the entropy of a gas is the highest (compared to liquids and solids), shouldn't the free energy of the gas be the lowest at a certain temperature?

Matthew Lin 2C
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Re: Gibbs Free energy

Postby Matthew Lin 2C » Tue Feb 06, 2018 5:03 pm

Yes Gibbs free energy is lowest as a solid because it takes heat and a positive deltaH for the substance to go from a solid to a liquid and from a liquid to a gas. So even though the entropy might be greater as a gas, the enthalpy is higher so the overall G is higher in gases.

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