Dear Kanji,

Here are the examples as to how to calculate it. Hope it help.

What is the entropy of the univariate Gaussian?

= ln, then the units are “ nats” or natural units of information. Let’s work through the entropy calculations for the univariate and multivariate Gaussians. Entropy of the univariate Gaussian.

Entropy of the Gaussian - Gregory Gundersen

gregorygundersen.com/blog/2020/09/01/gaussian-entropy/

When does the entropy of a crystal increase?

Some of the other answers have mentioned free energy, but this is really just a fancy way of saying that the total entropy of the crystal and its surrounding liquid has increased. The free energy is applied when the temperature of the whole system can be assumed to be constant.

Entropy and Crystal Growth - Physics Stack Exchange

physics.stackexchange.com/questions/54493/entropy-an …

How to find the change in total entropy?

The change in total entropy is Δ S total = Δ S crystal + Δ S liquid = Δ S crystal + Δ U liquid / T = Δ S crystal − Δ U crystal / T. However, there is a tradition in physics to multiply this by − T, which puts it into energy units: Δ A crystal = − T Δ S total = Δ U crystal − T Δ S crystal.

Entropy and Crystal Growth - Physics Stack Exchange

physics.stackexchange.com/questions/54493/entropy-an …

How are entropy changes calculated in aqueous MgCl 2?

Entropy changes can be calculated using the “products minus reactants” rule or from a combination of heat capacity measurements and measured values of enthalpies of fusion or vaporization. Crystalline MgCl 2 has S ° = 89.63 J/ (mol·K), whereas aqueous MgCl 2 has S ° = −25.1 J/ (mol·K).

Chapter 16.2: Entropy Changes and the Third Law of ...

you may find this file helpful https://faculty.missouri.edu/~glaserr/8330f16/PBC-Guide.pdf

Best,