The chemical potential of one component of a mixture cannot change independently of the chemical potentials of the other components. This statement relates to:
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The Gibbs–Duhem equation is vital for understanding the relationship between the chemical potentials of components in a mixture.
The Gibbs–Duhem equation describes the relationship between the chemical potentials of the components in a mixture. It states that the chemical potential of one component cannot change independently of the others, as their sum must satisfy a balance based on the total molar Gibbs energy of the system. This equation is essential in understanding the thermodynamics of multi-component systems. Hence, the correct answer is (2).
Final Answer:
\[
\boxed{\text{(2) Gibbs–Duhem Equation}}
\]