Elementary Principles 214

# Elementary Principles 214 - 6.68(cont'd c(i x A = 0.34 y A...

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6- 48 6.68 (cont’d) c. (i) xy AA == 034 055 .; . (ii) Mole bal.: 1 0.762 mol vapor, 0.238 mol liquid A bal.: 0.50 0.55 0.34 76.2 mole% vapor VL nn =+ ⇒= = (iii) 33 3 () E ( l ) 0.791 g/cm , 0.789 g/cm 0.790 g/cm Al l ρρ ρ (To be more precise, we could convert the given mole fractions to mass fractions and calculate the weighted average density of the mixture, but since the pure component densities are almost identical there is little point in doing all that.) ( ) ( ) ( ) AE 58.08 g/mol, M 46.07 g/mol M 0.34 58.08 1 0.34 46.07 50.15 g/mol l M + = Basis: 1 mol liquid (0.762 mol vapor / 0.238 mol liquid) = 3.2 mol vapor Liquid volume: mol g / mol g/cm cm Vapor volume = mol 22400 cm (STP) (65 + 273)K mol 273K cm Volume percent of vapor volume vapor 3 3 3 3 = = + ×= V V l v ( . ) (. ) . : . , , . .% 15 0 1 5 0790 6348 32 88 747 88 747 88747 100% 99 9 d. For a basis of 1 mol fed, guess T , calculate n V as above; if n V 0.20, pick new T . T x A y A f V 65 ° C 0.34 0.55
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