quiz312.pdf - Name~k.tJ-=-~U)~hJ-e_·~­ Chem 1721/1821 Quiz 3(20 points ln[AJ =-kt ln[A 0 l[A =kt l[A 0 tl/2 tl/2 I =.693/k =l/k[A fA]=-kt t 112 0

quiz312.pdf - Name~k.tJ-=-~U)~hJ-e_·~­ Chem 1721/1821...

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2 Chem 1721/1821 Quiz 3 (20 points) Name~~~~k:.tJ---=----+---~U)~hJ.-e..._·~~~~- February 21, 2013 ln[AJ =-kt+ ln[A] 0 tl/2 = .693/k l/[A] =kt+ l/[A] 0 tl/ 2 = l/k[A] 0 f A]= -kt+ [AJ 0 t 112 = [A]J2k I. 2. 3. Consider the reduction of Fe 3 + by Sn 2 +: 2 FeCl 3 (aq) + SnCl 2 (aq) -+ 2 FeCl 2 (aq) + SnCl 4 (aq). a. The average rate of consumption of FeCl 3 between 8.00 and 12.0 min is 2.325 x 10- 3 M•min- 1 . . 02. (.. 3i lv1 If the 1FeCl 3 ] = 0.03568 Mat 8.00 min, determine 1FeCl 3 ] (in M) at 12.0 min. . -3 .-I b. Calculate the average rate of formation of SnCl 4 (aq) over the same time period (8.00 to 12.0 min). I •I "'3 ~I{) M·~ c. Is the rate of consumption of SnCl 2 (aq) {less than, greater than, or equal to} the rate of formation of SnC1 4 (aq) over the same time period? ~Lu:l.l i'"() Consider the following data for the reaction X + Y -+ Z: L I 2. ~' ~Q/\L I ~ 2. : r;J J i"' t.re a.o.w .- j · >< , ."K.. [X] 0 ,M [Y] 0 ,M initial rate, M•s- 1 0.0084 0.0250 1.05 x 10- 2 0.0084 0.0300 1.51 x 10- 2 0.0042 0.0250 4.2~ to ~= . 002.f.o3 ill\V\.LCVUA b!::f /. 2. L -: '·~}C :. 2,...,.;;[ 0 ..-ii t.',... : " ~ ~)AA.\,. I ~ 3 : (X. J .-~ CAlA.4.&6 b '1 .:I. x I 1"7'..'k .. ft\~ bM 11' )< : 2.. "'--t-'o..-cl-«r ,•,..._ /< a. Write the rate law for this reaction. b. What is the overall order of this reaction? ~-k ~ * [x] 2. Qj] 2. '-t 't-11 c. d. Calculate k for this reaction (be sure to include units). US-t '-><'f° t I = · Cl DS M · s-': it ( .IJO&Lf t..t)' (. 02. S1)) L. ..k_-:. ~. 3~ XIOS" M-~ s-1 Calculate the rate of this reaction if [X] = 0.194 Mand [Y] = 0.590 M. n.k-:. (~.3~x1os- ~-~ s-•)(.l'il/ M)2. (. SttoM)i. _ 3 . I~ x I bd M · s - I 3120 M·s~I Consider the reaction A-+ products. For this reaction a plot of l/[Al vs. time results in a straight line with slope= .222 M- 1
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