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Problem 55

Use data from Appendix IIB to calculate $\Delta S…

Problem 54

Rank each set of substances in order of increasing standard molar entropy $\left(S^{\circ}\right) .$ Explain your reasoning.
\begin{equation}\begin{array}{l}{\text { a. } \mathrm{I}_{2}(g) ; \mathrm{F}_{2}(g) ; \mathrm{Br}_{2}(g) ; \mathrm{Cl}_{2}(g)} \\ {\text { b. } \mathrm{H}_{2} \mathrm{O}(g) ; \mathrm{H}_{2} \mathrm{O}_{2}(g) ; \mathrm{H}_{2} \mathrm{S}(g)} \\ {\text { c. } \mathrm{C}(s, \text { graphite }) ; \mathrm{C}(s, \text { diamond }) ; \mathrm{C}(s, \text { amorphous) }}\end{array}\end{equation}


PART $\mathrm{A} : \mathrm{F}_{2}(\mathrm{g})<\mathrm{Cl}_{2}\left(\mathrm{g}<\mathrm{Br}_{2}(\mathrm{g})<\mathrm{I}_{2}(\mathrm{g})\right.$
PART $\mathrm{B} : \mathrm{H}_{2} \mathrm{O}(\mathrm{g})<\mathrm{H}_{2} \mathrm{S}(\mathrm{g})<\mathrm{H}_{2} \mathrm{O}_{2}(\mathrm{g})$
PART $\mathrm{C} : \mathrm{C}(\mathrm{s},$ diamond $)<\mathrm{C}(\mathrm{s},$ graphite $)<\mathrm{C}(\mathrm{s},$ amorphous $)$



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Video Transcript

So for this problem, we want to rank these in order of increasing Miller entropy. So for part A, you want to see which one will have the house entropy. And so, with this kind of trend, if you look down the periodic table, you can see as you increase in molar mass or go down the periodic table that entropy increases. So it would go like this. But by God, I'm having the greatest entropy. Um, for B, we have to compare 223 and you can compare. But Mueller Mass So h 20 has less more mass Stage two s. And while h two s and its draft similar mole mass is H 20 is a more complex molecule. Has more adams on it, so it would have greater entropy. That's what causes it went out. Finally we see we're comparing different Allah tropes of carbon. So diamond is very rigid, so but that is having the least entropy. And then you have graphite, which still structured, but it has more freedom to it. So that would be second place. And then the one has the most entropy would be a more office, um, one, because that is the most disordered where the place in the Carmen's is very disordered. Two It go diamond graphite in a more office in just in terms of how the carbons are structured, how much freedom they have.

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