17_kinetics_rates (2)

2nog o2 2no2g 4 11202013 put red hot steel wool in

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Unformatted text preview: l wool in pure O2 and it reacts vigorously to make Fe2O3 steel wool glows red hot when heated in air What’s the difference? [O2] • • • • • • • overall order is sum of orders orders don’t have to be integers usually experimentally determined can discount proposed mechanisms overall reaction not the same as an elementary step SI unit of concentration is mol dm-3 which is same as mol L-1 dm=10 cm 5 11/20/2013 H2(g) + Br2(g) 2HBr(g) observed rate law / 1 " indicates that a more complicated, multistep mechanism is at work Typical Example for Simple Kinetics ratio run 3 to run 1 , , . . , , , , 1.22 10 6.12 10 = . . . . = . . = . . 2.30 1.15 ln 1.22 10 ⁄6.12 10 ln 2.30⁄1.15 0.995 1 considering errors 6 11/20/2013 Typical Example for Simple Kinetics ratio run 2 to run 1 , , . . , , , , 1.36 10 6.12 10 = . . . . = . . = . . 1.72 1.15 ln 1.36 10 ⁄6.12 10 ln 1.72⁄1.15 1.98 2 considering errors considering errors means an error propagation 7 11/20/2013 Typical Example for Simple Kinetics 2NO2(g) + F2(g) 2NO2F(g) using run 1, get rate constant , , , 6.12 10 1.15 1.15 4.02 10 where M is mol/L 8 11/20/2013 First-Order Reactions Consider the process in which methyl isonitrile is converted to acetonitrile. CH3NC CH3CN First-Order Reactions CH3NC CH3CN This data was collected for t...
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