Elementary Principles 346

# Elementary Principles 346 - 8.92 a. mA (g A) @ TA0 (oC) nA...

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8-67 8.92 a. m A (g A) @ T A0 ( o C) n A (mol A) n S (mol solution) @ T max ( o C) m B (g B) @ T B0 ( o C) n B (mol B) Refs : A(l), B(l) @ 25 ° C substance n in ± H in n out ± H out A n A ± H A n in mol B n B ± H B ± H in J / mol S n A ± H S (J mol A) Moles of feed materials : n m M n m M A (mol A) = (g A) (g A / mol A) , A A B B B = Enthalpies of feeds and product ± ( ± ( / / ± ( ( ± () ( ( ±± () ( ) ( ) max max Hm C T C T rn n mM H n nH r mm C T H n nHr m mCT AA p A A BB p B B BA S A Am AB p s S A A B p s =−=− = F H G I K J = × F H G I K J ++ × F H G I K J ×− L N M M M M M O Q P P P P P ⇒= 00 25 1 1 oo o o C), C) (mol B mol A) = J mol A mol A) J g soln) J g soln C C) Δ Δ Energy balance Δ Δ Δ HnH nH nH m M Hr m mC T mC T T m M Hr C AS A A m A B ps A pA A B pB B Ap A A Bp B B A A m p s =−−= ⇒+ + = + −+ −− + ± ± ± ± ± max max 0 25 25 25 0 25 25 25 bg b g b g b g Conditions for validity : Adiabatic mixing; negligible heat absorbed by the solution container,
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