lecture 15 - chem

lecture 15 - chem - General & Analytical Chemistry II...

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1011-216 Winter 2008/2009 Lecture 15
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Temperature Dependence of Reaction Rates • The rate law relates the reaction rate to concentration. • For aA + bB products rate = k[A] X [B] Y • The rate constant, k, increases drastically with temperature. • Many reaction rates double when the temperature is increased by 10 o C. k T
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Arrhenius Equation = RT E a Ae k A = frequency factor E a = Activation Energy R = 8.314 J/mol.K Universal Gas Constant T = absolute temperature in Kelvins Since k varies drastically with temperature, we usually work with l nk to relate to experimental data. RT E A k a = ln ln
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E a and A from Experimental Data A graph of l nk vs. 1/T should give a line with slope = -E a /R intercept = l nA Data for 2N 2 O 5 4NO 2 + O 2 Slope = -1.2x10 4 K E a = -(slope)(R) E a = -(-1.2x10 4 K)(8.314 J/mol.K) E a = 1.0x10 5 J/mol = 100 kJ/mol RT E A k a = ln ln
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This note was uploaded on 03/18/2010 for the course COS 101121501 taught by Professor Langner during the Fall '08 term at RIT.

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lecture 15 - chem - General & Analytical Chemistry II...

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