Effect of Pressure on Free Energy

From the definitions of the Gibbs free energy and enthalpy, 

This is an important equation as it tells how free energy, and hence equilibrium position, varies with pressure and temperature. 

If the variation of V with P is known for die substance of interest, this equation can be integrated. For a simple case of one mole of an ideal gas, PV = RT. Thus 

This equation gives die change in free energy on expansion or compression. 

One mole of an ideal gas is compressed isothermally at 298K to twice its original pressure. Calculate the change in the Gibbs free energy. 

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Figure 4.2 (A) Effect of pressure on free energy formation of an oxide produced with an increase in the...

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