The Arrhenius equation- AP

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Presentation transcript:

The Arrhenius equation- AP

T = temperature in kelvin Exponential form R = gas constant = 8.314 J K–1 mol–1 T = temperature in kelvin Exponential factor, e–Ea/RT: proportion of molecules that have sufficient energy for a reaction to take place Pre-exponential term (frequency factor), A, accounts for the frequency of collisions with the correct orientation

intercept on the y-axis, c = ln A. Logarithmic form A plot of ln k against 1/T gives a downward straight line graph of the type y = mx + c gradient m = –Ea/R intercept on the y-axis, c = ln A.

Graph of ln k against 1/T

Ea from an Arrhenius plot

Two- Point Form The rate constant for the reaction H2(g) + I2(g) ---> 2HI(g) is: 5.4 x 10-4 M-1 s-1 at 326C. 2.8 x 10-2 M-1s-1 at 410 C Calculate the a) activation energy