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Interpretation:
The rate constant for the decomposition of a certain substance is k = 3.80×10-3dm3mol-1s-1 at , T = 308 K and k = 2.67×10-2dm3mol-1s-1 at T = 323 K. The Arrhenius parameters has to be evaluated.
Concept Introduction:
Arrhenius Equation:
The temperature dependence characteristics of reaction is normally expressed mathematically by introducing two parameters, one representing the intercept and the other the slop of the straight line of a so-called ‘Arrhenius plot’ of ln k, against 1/T and writing the Arrhenius equation.
lnk = lnA - EaRT
A is the parameter obtained from the intercept of the line at 1/T = 0 is called the frequency factor. The parameter Ea is called the activation energy. The two quantities are collectively known as Arrhenius parameters.
Figure.1
If the activation energy of a reaction is known, the value of a rate constant k2 at a temperature T2 can be predicted from its value k1 at another temperature T1
That is:
lnk2lnk1=EaR[1T1-1T2]
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Chapter 17 Solutions
ATKINS' PHYSICAL CHEMISTRY-ACCESS
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