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# Key to exam II - Exam II CHM 331 Name V v 1 ill,t Equation...

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CHM 331 Exam II V v Name 1 ill ,t.. ........ Equation sheet provided. This exam has FIVE questions. All questions carry equal credit. -- 16November, 2008 Time: 50 min Dr. Jumean

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, ---------- 1. Derive the integrated rate expression for the following system of simultaneous first and second order reactions: A/P P k 1, first order k2, second order -~. C9 Iz, CA) T kvUt)'-- ~ Jt --- .- ci A- -:r::-- tI'/f:' -dA 1- r) t1 ..Jc~ 1- />r 1-- " It 3- kk \e~ t1 r I --- A C k'"x KL P) -- --- /' f Olk~~{I-) ~ ~ A ~ I ~\Z \ :;. \ rp~t- ~ t:::- 0 kt)~ ~rc;) cD U- d (:r -- 'r ~ d /'.- ~ t:- -t;, () ~ C 11', '" ~L ~) AD [ IA A- '\ ~ 1:- ~ A ~ fr- j /-' l - J- -f . ~ 'l-- . 'y( ,-\- 1e'L A 't' I-'t" 1 I' , thv~b1 ~ ~I t- ~ I -\ ~ A-~ r.\.- 5~hSJ.1D \ ~ e9 'R£ Q,,((~V\~ hi )
-/ 2. The reaction A + B -7 D occurs by the mechanism: Step 1 Step 2 Step 3 A+B-7AB AB-7A+B AB-7D k1 k2 k3 a) Derive the rate law for the formation of the product D on the assumption that AB is in steady state. ~ ~1)- ;: '-rJ r vi(i6) / 0 ::: (lP (.4 1'» ~ C9 ~~ ~~) ~ I @) ( f~) - 'k1-~ - k!1(¥\6) k, Q\ ) (\S') - r- ' e9 ~ K k\e') ~ (y (j) <) "-~)-,.f:j; cD f\- \<> cD rA 1) ,- -p- \Q \ \t<:I QI) C Irs) ~ \e1--\k- ) - ~-C9 b) Obtain an expression for the overall activation energy in terms of the activation energies of the three steps (Eah Ea2and Ea3).

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Key to exam II - Exam II CHM 331 Name V v 1 ill,t Equation...

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