## The sign of entropy

Volume: $\Delta S = nR\ln \frac{V_{2}}{V_{1}}$
Temperature: $\Delta S = nC\ln \frac{T_{2}}{T_{1}}$

Jose Robles 1D
Posts: 100
Joined: Fri Aug 02, 2019 12:15 am

### The sign of entropy

In a problem, what determines the sign of entropy? The direction of rxn?

Wilson 2E
Posts: 100
Joined: Sat Aug 17, 2019 12:18 am

### Re: The sign of entropy

Based on the equations nRln(V2/V1) and nCln(T2/T1), the only way to get a negative delta entropy would be to have the ln term be negative. This would occur by having a decrease in volume or temperature, which produces a value less that 1 for V2/V1 and T2/T1, giving a negative number when using ln.

saigorijavolu2k
Posts: 108
Joined: Sat Sep 28, 2019 12:15 am

### Re: The sign of entropy

that is a very good question. I think that the sign of entropy is determined by how much disorder there is. If the substance is moving from solid to liquid, entropy is positive and vice versa.

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