Gibbs-Duhem equation
Gibbs-Duhem equation Correct Answer States that n<sub>1</sub>dμ<sub>1</sub> + n<sub>2</sub>dμ<sub>2</sub> + .... n<sub>j</sub>dμ<sub>j</sub> = 0, for a system of definite composition at constant temperature and pressure
The Gibbs-Duhem equation states that $$\sum\nolimits_{i\, = \,1}^n {} {n_i}d{\mu _i} = 0$$Here the addition to be done for an particular component in different phases.