## Midterm 6D

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

Ellen Amico 2L
Posts: 101
Joined: Thu Sep 19, 2019 12:16 am

### Midterm 6D

I'm confused on why question 6D isn't answer choice C because going from solid to liquid would lead to an increase in entropy, and this seems to be largest relative to the other answer choices. Could someone explain this?

Deepika Reddy 1A
Posts: 125
Joined: Thu Jul 11, 2019 12:15 am

### Re: Midterm 6D

Two of the answer choices can be crossed out immediately. I crossed out B because C(diamond) is more ordered than C(graphite) so entropy was decreasing because there are fewer states or positions that the particles can assume. In D, the gas and liquid are going to two aqueous so it can be crossed out. And then, in class, he said that the transition from liquid to gas increases the entropy a lot more than the transition from solid to liquid so that is why A is the answer.

Zoe Gleason 4F
Posts: 51
Joined: Tue Jul 23, 2019 12:15 am

### Re: Midterm 6D

Both A and C involve changing the phase change to one with more entropy. However, the answer is A because that change is associated with a larger increase in entropy then the phase change from solid to liquid.

Megan Cao 1I
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Joined: Sat Sep 07, 2019 12:18 am

### Re: Midterm 6D

C changes from solid to liquid and A changes from liquid to gas. A gas has the highest entropy of all three phases. therefore, the change of a substance to it's gas phase would have the most change in entropy

Anish Natarajan 4G
Posts: 51
Joined: Thu Jul 25, 2019 12:16 am

### Re: Midterm 6D

If I recall correctly there are two phase change options, one being the transition from solid to liquid and the other one being from liquid to gas. The entropy change associated with the latter option is larger

Veronica_Lubera_2A
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### Re: Midterm 6D

Gases have the highest entropy possible because they take up a lot of space (volume) and can be arranged in multiple positions because of their high speed and free movement. Therefore, option A only had the option of a gas in the products.