chem 14.docx

# chem 14.docx - Experiment 14 Post Lab Calculations 1 Hand...

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\ Experiment 14 Post Lab Calculations 1. Hand in the three plots (zero, first and second order) and the Excel worksheet of your data and results. See attached 2. Is the reaction zero, first or second order with respect to dichromate? This reaction is first order with respect to dichromate. As indicated by the graphs displaying the relationship between time and absorption, the graph of the first order dependence is the most linear with the highest R-squared value. 3. What is the value of the rate constant? What are the units? ln(A t ) = ln(A 0 ) – kt ln(A 200 ) = ln(A 0 ) - 200k 1.052 = -.192 – 200k 1.244 = -200k k = .0062 4. Thermal decomposition of nitrogen dioxide to nitric oxide and oxygen occurs according to the following reaction:2 NO2 → 2NO + O2 The rate law is: -d[NO2]/dt = k [NO2] x Use Excel to determine the order and rate constant of the reaction given the following data: Plotting the relationship of Concentration and Time of the NO2 reaction in Excel, we can see that the reaction is of 1 st Order dependence, for the R-squared value for the first order

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• Spring '12

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