5_60_lecture30

5_60_lecture30 - MIT OpenCourseWare http:/ocw.mit.edu 5.60...

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MIT OpenCourseWare http://ocw.mit.edu 5.60 Thermodynamics & Kinetics Spring 2008 For information about citing these materials or our Terms of Use, visit: http://ocw.mit.edu/terms .
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5.60 Spring 2008 Lecture #30 page 1 Kinetics: Reaction Rates, Orders, Half Lives aA + bB cC + dD Rate of Reaction: 1 d [ A ] 1 d [ B ] 1 d [ C ] 1 d [] D Rate = − = − = = a dt b dt c dt d dt N Experimentally Rate = k C i γ i i = 1 Where k = rate constant C i = Concentration of Reactant “i” γ i = Order of reaction with respect to reactant “i” γ i = Overall rate of reaction i
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5.60 Spring 2008 Lecture #30 page 2 I) Zero Order Reactions (rare) A products d[A] = k {k is in [moles/(liter sec)]} dt [A] = -kt + [A] o [A] o [A] o /2 t 1/2 t [A] t 1/2 = [A] o /(2k)
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5.60 Spring 2008 Lecture #30 page 3 II) First Order Reactions A products d[A] = k[A] {k is in [1/sec]} dt [A] = [A] o e -kt ln[A] = -kt + ln[A] o ln[A] ln[A] o t Slope = -k t 1/2 = (ln 2) / k = 0.693/k k = (0.693)/(t 1/2 )
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5.60 Spring 2008
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5_60_lecture30 - MIT OpenCourseWare http:/ocw.mit.edu 5.60...

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