Elementary Principles 205 - 6.56 B = benzene, T = toluene...

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6- 39 6.56 B = benzene, T = toluene ± (/ m i n ) n v mol at 80 C, 3 atm o y N2 (mol N 2 /mol) 10 L(STP)/min x B [mol B(l)/mol] y B [mol B(v)/mol] ± ( n N mol / min) 2 x T [mol T(l)/mol] y T [mol T(v)/mol] ± . n N2 2 L(STP) / min 22.4 L(STP) / mol = 0.4464 mol N / min = 10 0 Antoine : () ( ) 6.89272 1203.531 80 219.888 80 C 10 757.6 mm Hg B p −+ °= = ( ) 6.95805 1346.773 80 219.693 80 C 10 291.2 mm Hg T p = a. Initially, x B = 0.500, x T = 0.500. N balance mol N / min = mol / min mol min mol B mol mol B(v) min mol min mol B mol mol T(v) min 22 v v B T :. ± (. . ) ± . ± .. . ± . 0 4464 1 0166 0 0639 05797 0166 0 0962 0 0639 0 0370 0 0 nn n n −− = ⇒= F H G I K J F H G I K J = = F H G I K J F H G I K J = b. Since benzene is evaporating more rapidly than toluene, x B decreases with time and x T (= 1– x B ) increases. c. Since x B decreases, y B (= x B p B */ P ) also decreases. Since x T increases, y T (= x T p T */ P ) also increases. 6.57 a. Pxp T xp T
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