Exam 1 p2 - 3 For the decomposition of a particular...

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Unformatted text preview: 3. For the decomposition of a particular substance A: (a) If the initial concentration is 0.060 M , what is the concentration afier one half-life? [A]oi11itia1= 0.060% [Alatt1/2= 0:030 “1 L"? depnrh‘om (b) For the initial concentration in (a), if it takes 143 s for 50.0% of A to decompose by second—order kinetics, what is the value of the rate constant? \ L+9st ,. t at it.“ ;E_~.J_,_‘ 127:1: We 3111:30: a (L EAL [AL [AL ‘t‘ : I‘Rs e4: -——~‘ ‘— ———~———-——-—‘ - O-\'l M" s" a L ' /" IthLA’io (VHS) (0 060 M» "“ e 4M0? s) (c) A first—order reaction has a half-life of 686 s . How long will it take for the reaction to go to 85% completion? (Hint: What type of rate-law e pression do you need to use?) __ ll %_ E». '— 2“ £3 x(a) 2805 (b) 1400s (0)13705 ((d) 1880;) (6) 30005 n ‘3, (1, {a ' ’ n i r. _ t tn[A]:€m[/\1U_&t New at 0“ Elle - rut/~10 “my? in: a; i1 2 ‘yu’ t( 1 égég a: 2’“?- —' ‘_O\X\O'3 S—i A“ j (984-6 M 252 ampleam EA] 2 045 1A1: Q“ on; LAL 2“ [A1, a Locum" s") t Edens) '2'. ~6.cixto’35")t r 3 t: Moo 5 ok i-‘fxto n; 4. (a) In addition to concentration, what two underlying factors determine the rate of chemical reactions? ’ ‘ H K . The ahergi c-Q collisions (king; enerfi (a? wclewfes lmdoldcci m (L adherent) The rela‘i’rdfi ci’ififii’ui’t‘on °£ imuleude> Undergoims, ‘O'HSTGV‘ ‘ g2. ‘: A e'E‘L/M (b) Of these two factors, which one is represented by the exponential term in the Arrhenius equation? Ehsvga “(r bili‘sicné (c) Why does temperature influence the rate of chemical reactions? T 46 i’ermiw‘ES “HI“?- oliéi'f‘lbuiVVH a; klweHc. 63:163sz a; molecule 9/ aha l'laerezgre Hue etxeraj ’1‘? wllifi‘tens felqi’lve +0 Ea (d) The activation energy for the reaction N02 (g) + CO (g) —) NO (g) + C02 (g) is 125 kJ/mol, and AE for the reaction is -216 kJ/rnol. (i) Draw the reaction profile (energy diagram) for this reaction, labeling E8 and AE. (ii) What is the value of the activation energy for the reverse reaction? \‘ ma - Louvirmui’a ...
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