Elementary Principles 233 - 6.84 Moles of diphenyl (DP):...

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6- 67 6.84 Moles of diphenyl (DP): Moles of benzene (B): g 154.2 g mol mol 550.0 ml 0.879 g 1 mol ml 78.11 g mol mol DP mol DP 56 0 0 363 619 0363 0 0544 . . . . .. . = = U V | | W | | ⇒= + = x pT x pT DP B * B * mm Hg mm Hg bg b g =− = = () . 1 0 945 120 67 114 0 Δ Δ T RT H xC T m m0 m DP o m K=3.6 C == + =⇒ = = ° 2 2 8314 2732 55 9837 00554 36 55 36 19 ± . . . . Δ Δ T RT H x T bp b0 v DP o b K=1.85 C C + = + = ° 2 2 8 314 2732 801 30 765 0 0554 185 801 185 82.0 ± . , 6.85 oo 0 Eq. 6.5-5 Table B.1 2 2 0 2 2 0 0.0 C, 4.6 C=4.6K ˆ (4.6K)(600.95 J/mol) 0.0445 mol urea/mol ( ) (8.314 J/mol K)(273.2K) (8.314)(373.2) Eq. (6.5-4) 0.0445 1.3K ˆ 40,656 mm u m b bu v TT TH x RT RT Tx H = ΔΔ = ⇒Δ = = = = Δ ⎯⎯⎯→ o 1.3 C 1000 grams of this solution contains m u (g urea) and (1000 – m u ) (g water) 11 1 1 (g) (1000 )(g) (mol urea) (mol water) 60.06 g/mol 18.02 g/mol
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