Question

Estimate the change in chemical potential for pure octane when its temperature is raised from 293 K to 298 K at a constant pressure.

Answer 1

For a single component(pure species), Gibbs free energy is the same as the chemical potential.

So change in gibbs free energy which is given by one of the Maxwell relations,

At constant pressure dP = 0, the euation becomes,

Standard molar entropy can be used since the temperatures are around standard conditions (298 K).

Data :

Standard molar entropy of octane (So)= 361.20 J/mol K .