Sapling question 7

[Lucy Weaver 1K]

Does anyone understand why the higher entropy values were the ones associated with being the most ordered in this problem? I was under the impression that a higher entropy value would mean more disorder. C2H5OH has a delta S of 121.75, C6H6 has a delta s of 33.77 and C4H10 has a delta s of 21.6.

[Janna Shakiba]

Hi, I do not know (sorry!), but I was wondering if you were able to solve the rest of the problem? If so, do you mind sharing your steps? I'm stuck on this one.

[RitaThomas_3G]

Answering the above equation^, you have to first find the amount of energy supplied in Joules by multiplying the # of minutes * 60s/1min * J/s (this value should be given in the equation). Then, the delta h vap value is calculated by dividing the amount of energy supplied that you just calculated by the # of moles. You get this by subtracting the final - initial grams, then use molar mass to convert to moles. Then, the delta s vap value is calculated by doing delta h vap / T.

[Taylor K 2D]

I was a little confused on this as well but I think that because it's asking about the entropy of the liquid samples that the order would be reversed, so the molecules with the highest entropy in gaseous form would have the lowest entropy in liquid form? Again I am not completely sure :/

[Earl Garrovillo 2L]

I misread this at first but it's actually because the question is asking for orderliness when the samples are liquids. Larger ΔSvap means that when a liquid became gas, the entropy changed by the ΔSvap. Since C2H5OH has the largest ΔSvap, it's gas form is the most disorderly but it's liquid form is substantially more ordered. Applying the same logic to the other samples is why a larger ΔSvap means more order for a sample's liquid form but less order for it's gas form.

[Gicelle Rubin 1E]

I'm not entirely sure because I'm still stuck on the rest of that problem. I was wondering if you were able to solve it and if so, how?

[Jiayi Wu 3J]

Hope this would help! https://lavelle.chem.ucla.edu/forum/viewtopic.php?f=131&t=74937&sid=65b8171590d6edb678b1e684a219febf

[Aanya Tanti 3C]

It is asking for disorder for liquids. For compounds with the greater S vap, the gas is more disordered while the liquid is highly ordered.

[Anusha Chaudhary 1J]

In this question, we are asked to organize the entropy of the liquid forms of the samples given. If we assume that all three samples have roughly the same final entropy, we can then use the delta S values found. The values with the greatest change in delta S means that the initial entropy was lower, and therefore the most ordered. This logic can be applied to the other two compounds in order to answer the question.