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At equilibrium condition, the chemical potential of a material in different phases in contact with each other is equal. The chemical potential for a real gas (μ) is given by (where, μ = standard chemical potential at unit fugacity (f° = 1 atm.) and the gas behaves ideally.) ?

μ° + RT ln f
Bμ°+ R ln f
Cμ° + T ln f
Dμ° + R/T ln f

Correct Answer: A. μ° + RT ln f

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