CHEM 132L, Spring 2017 Cobalt complex Kinetics Lab 8/9 Create an Excel spreadshe

Question

CHEM 132L, Spring 2017 Cobalt complex Kinetics Lab 8/9 Create an Excel spreadsheet. In your spreadsheet, you should have AT LEAST the following columns, labeled at the top of the column so I can tell what you're doing time in minutes 2. measured absorbance 3. (Abe-A)/(Aco-Ao), where Aco is your last measurement. 5. In (c) You should then plot the In(c) versus time. a line. Show the equation of the line and the R2 on the graph, and then copy those quantities below. Your graph should have a title, carefully labeled axes, and units. ONE group member should attach a print out of your graph AND data table from Excel. Name of group member with printout LAHmfom Equation of line: y o 874 x t 214 R2 Class data: Place rate constant values for each temperature from the class in this table. Each row should contain the k values different groups found for their reaction. Temperature k (min 50 °C 60 °C T, Average k at 50 oc 0. o953 min 2 Average k at 60 oc 8 63 min Activation energy (use Arrhenius equation, show work!): 59,96 kJ/mol 323 k 333 IS k 8703 An sn 0.09 min 333. 323 Sk. mo 3/4

Explanation / Answer

Calculate Ea :

ln (k2/k1) = Ea/R [1/T1-1/T2]

or, ln (0.0736/0.162) = Ea/8.314 J/K/mol [1/333.15-1/323.15]

or, Ea = 70616.18 J/K/mol

Then use the value of Ea and k value at 50oC to calculate k at 25oc

ln (0.0736/k) = 70616.18 J/K/mol/8.314 J/K/mol [1/298.15-1/323.15]

or, k = 0.00812 /min

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To get a more accurate value. You should measure one more value at very low temperature . (use a ice bath). Then plot the lnk vs 1/T to get the value of Ea from graph

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