Entropy of Mixing

Entropy of Mixing

### Formula:

$$\Delta S_{mix}=-nR\sum X_i\ln X_i$$

### Terminologies:

- ΔS_mix → Entropy change during mixing.

- n → Total number of moles.

- R → Gas constant.

- X_i → Mole fraction of component i.

- ln → Natural logarithm.

### Usage:

- Used to calculate entropy change when gases or solutions mix.