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CH8_Page_02

# CH8_Page_02 - 155 Torr ﬂHDW 76 Torr 230.40 K 485 Ton...

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Unformatted text preview: 155 Torr _ _ ﬂHDW 76!] Torr 230.40 K 485 Ton _ _ 31H "“1, T6!) Torr 278.2 K S.3l4J-K."-mol'l x In +ﬂS°m 8.314J-K" ontol—I x In +n3°m which give, upon combining terms, “13.22 J -K" -tnot" = -u.093 994 K—1 x mam + new 45.734 J -K" -rnol"' = 41903 1560 K" x am“? + Assam Subn‘aetzing one equation from the other will eliminate the 953°“, term and allmv us to solve for mew : —9.49 JLK'l ~mol" = —0.ﬂt}0 334 K" x AH°W M0?” = +2s.4 k1 -mel" (b) We can then use 11H “m to calculate 5.9pr using either of the two equations: 43.22 J eel -mol" = 43.093 994 K‘] x (+23 409 J mm") + new a _ 2 —I —1 1515‘ w—lﬂﬂxlt} J-K +1110] 4.934 J -K" -mol" = 43.003 I560 K"1 x {+28 499 I-mol'l) + e31“, .950"? =1.99><1t:2 J-K" incl" :3 e isea ate usmgﬂ. = — [)Th no” ' leul d ' G”, M“, TM”, 1']!- no: 2 +284 1;] quot" — (293 K)(lﬂt} J -K'l ~mol" }f{lﬂﬂﬂ I M") no“, = —1.4 kJomol'] Notice that the standard LEG“; is negative, so the vaporization of (3102 is spontaneeus as expected; under those conditions it is a gas at room temperature. {d} The boiling point can be calculated using one of several methods. The easiest to use is the one developed in the last chapter: 93.6““? = MD“: — TBM°W = U 228 ...
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