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CH8_Page_25

# CH8_Page_25 - (c The solution will boil when the vapor...

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Unformatted text preview: (c) The solution will boil when the vapor pressure equals the external pmsure. Simply substitute the numbers once the equation has been derived: 3 mp=_m+m5 T 3- meek—Watts T = 339 K or 66°C (d) The equation of the line is written in such a form that the constant 10.5 is Mﬁ equal to R“ . ASE "P = 10.5 R amp =10.5 x satire-1.111014 = 8?.3 J -1t'l -mol" Because AS°m = 5"“, (benzene, 'g) - 3°” (benzene, l) we can now calculate the standard molar entmpy ofbenzenem) 813 J - K" -mol'1 = S°m{benzene, g] — 173 .3 J -K'1 -1nol" 3°“ (benzene, g) = ZEGJS J -K" mo!" 8.10% The equation to give vapor prmsure as a ﬁlnction of temperature is MO U lnP=— mxl+ﬂsw R T R _ 5‘? 81-‘-l.l-rnol'1 x-l—+ 124Iomol" 33141-314 -mol" T 8.314I-K_'-m01_' l]1P=—I5954K +143 In order for the substance to boil, we need to reduce the external pmsure on the sample to its vapor pressure at that temperature. Thus, the problem becomes sirnpl},r a matter of calculating the vapor pressure at 80°C: 25] ...
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