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CH8_Page_19

# CH8_Page_19 - 8.74 3.716 PM 0.494 x 151 Torr = “B =...

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Unformatted text preview: 8.74 3.716 PM 0.494 x 151 Torr . = “B = —-—— = 0.1502 *“mmm Pm, 124 Torr = 1 _ 0.602 =o.393 xcyﬁohnminvalm We are given the following infonnation: Pmm Em = 100. Ton" at 25°C, 35ﬁ.0g (12.10? g-mol'1 M.W.] Pmmm = 222 Torr at 25"C {58.080 griml—1 M.W.) PM = 135 Torr and Ramﬂt’s Law states: Punt : Xhumepbum one + Xpm‘plmPplupantnlﬂ. puns n :9um PM + W Pwmwm ”mull ”ml-II gwen time! = ”Mum + awn“ we can write: ”bum-Loo: _ butane PM = Phalanmn. rum + ”mm M Pmnm. pm "total Ii“111w“ Rearranging to solve fer ram]? n ("Wm'Pbuwmaem]_(nbmmne°I-‘ammm} ml Poul _ Ppmplm. pure _ (4.3535- 15101511111 Torr)—(4.8539 mol- 222 Torr) ' 135 Torr-222 Torr = 6.81 mol ?. Therefore, n m = "mm - 11mm” 2 6.31mo1—4.35 mol = 1.95 mol and massmm 21.95 1110168330 gvtnol'I =113 g Raoult’s Law applies to the vapor pressure of the mixture, so a positive deviation means that the vapor pressure is higher than expected for an ideal solution. Negative deﬂation means that the vapor pressure is lower than expected for an ideal solution. Negative deviation will occur when the interactions between the different molecules are somewhat stronger than the interactions between molecules of the same kind. 245 ...
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