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I'm not an expert teacher or lecturer of chemistry. I was only a student from SMA NEGERI 15 SURABAYA who had been one of the Bronze Medalist Participants of Olimpiade Sains Nasional X (2011) of Chemistry In Manado, North Sulawesi, 11 - 16 September 2011 and graduated in 2012. Now, I'm studying at Universitas Airlangga in Surabaya, Indonesia. I do love chemistry and I would like to help them who had difficulties in studying chemistry. That's why, please understand me if you found some misconcepts in my entries. Suggestions are always necessary in order to develop this blog. And I'm sorry because my English isn't so well.

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Wednesday, February 01, 2012

The Effect of Pressure to The Gibbs Free Energy in a Constant Temperature

Any conditions can effect any variables, this is the important principle we have to keep in our mind in knowing thermodynamics. In this post, We will discuss what is the effect of pressure given to a system, to the Gibbs free energy in a constant temperature.

First we have to know the relation between Internal energy (∆U), enthalpy change (∆H), Helmholtz Energy Function (∆A), and Gibbs free energy (∆G):


H = U + PV
A = U – TS
G = H – TS

So that:
G = U + PV - TS

From those equations above, we can conclude that:


Now, we can find the relation between those variables:

For Solids or Liquids


For Gases



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