The data below show the rate constant of a reaction measured at several differen
ID: 799695 • Letter: T
Question
The data below show the rate constant of a reaction measured at several different temperatures.
Use an Arrhenius plot to determine the activation barrier for the reaction??? Ea __________ Kj/mol
Use an Arrhenius plot to determine the frequency factor for the reaction??? A=______________s-1
Temperature (K) Rate Constant (1/s) 310 2.70 The data below show the rate constant of a reaction measured at several different temperatures. Use an Arrhenius plot to determine the activation barrier for the reaction??? Use an Arrhenius plot to determine the frequency factor for the reaction???Explanation / Answer
Rate constant k= k? e^(-?Ea/(RT)) -> ln(k) = ln (k?)-?Ea/(RT)
This function is a straight line y=a+b x with y= ln(k), a= ln(k?), b= -?Ea/R and x=1/T.
Linear regression results in a= 32.011, b= -10719.724 K . The coefficient of regression r=-0.99 that means we have a perfect fit.
Therefore k?= e^a= 7.89*10^13 1/s ( 2 sigfigs: 8.0*10^13 1/s) and b=-?Ea/R (R= 8.314 J/(mol K) )-> Activation energy ?Ea= 1289.36 J/mol ( 3 sigfigs: 1.29* 10^3 J/mol).
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