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Integrated Rate Law
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Integrated Rate Law This law is used when you are given __________ & __________ Yesterday (for the differential rate law) you were given a graph of concentration & rate
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Rate Law Summary
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Determining the order:
You will be given a chart of concentrations and time Make another column for __________ and __________ Use a few data points to find the slope of [A] vs time Do the same for ln[A] vs time Do the same for 1/[A] vs time The one that gives the straightest line gives the reaction order
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Example Determine the rate law & the value of k for the following reaction: 2N2O5 4NO2 + O2 [N2O5] Time (s) 0.0707 50 0.0500 100 0.0250 200 0.0125 300 400
![Example Determine the rate law & the value of k for the following reaction: 2N2O5 4NO2 + O2. [N2O5]](http://slideplayer.com./slide/15923565/88/images/5/Example+Determine+the+rate+law+%26+the+value+of+k+for+the+following+reaction%3A+2N2O5+%EF%83%A0+4NO2+%2B+O2.+%5BN2O5%5D.jpg "Time (s)")
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½ life Time it takes for ½ the reactant to be gone
What was the ½ life for the last problem?
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Example Determine the rate law & the value of k for the following reaction: 2C4H6 C8H12 [C4H6] Time (s) 0.01 1000 1800 2800 3600 4400 5200 6200
![Example Determine the rate law & the value of k for the following reaction: 2C4H6 C8H12. [C4H6]](http://slideplayer.com./slide/15923565/88/images/7/Example+Determine+the+rate+law+%26+the+value+of+k+for+the+following+reaction%3A+2C4H6+%EF%83%A0+C8H12.+%5BC4H6%5D.jpg "Time (s)")
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Example What is the ½ life for the last reaction?
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Another example A 1st order reaction is 38.5% complete in 480 seconds
Calculate the rate constant Calculate the value of the ½ life How long will it take for the reaction to go 25% 75% 95%
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Last example If the ½ life is 45 seconds, how much is left after 225 seconds?
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