CHEM-002 Lecture Notes - Lecture 20: Boiling Point, Diatomic Molecule
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22 Mar 2017
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Gases have higher entropy than liquids have higher entropy than solids the molecules can move around more in gas, so there are more microstates, etc. Also, the higher the number of electrons / higher molecular weight, the higher the entropy of the molecule. This holds fo(cid:396) si(cid:373)ila(cid:396) (cid:272)o(cid:373)pou(cid:374)ds (cid:449)he(cid:374) you"(cid:396)e goi(cid:374)g do(cid:449)(cid:374) the pe(cid:396)iodi(cid:272) ta(cid:271)le. Across the periodic table, the number of electrons decrease but the size decreases the space (cid:272)o(cid:448)e(cid:396)ed (cid:271)y the ele(cid:272)t(cid:396)o(cid:374)s de(cid:272)(cid:396)eases so (cid:449)e (cid:272)a(cid:374)"t (cid:396)ely o(cid:374) that (cid:396)ule. We need to compare two substances at the same temperature, because temperature makes higher entropy. *expect something like this in the third exam getting two substances and predicting entropy. Higher molecular weight (in the same column/phase/temp) O2 has a higher entropy because carbon monoxide has a triple bond, making it a smaller molecule. Either of these can be compared against argon . There are more electrons in argon than co or o2.
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