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InterviewSolution
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What is a frequency factor or pre-exponential factor? |
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Answer» Solution :In ARRHENIUS equation, `K=Axx e^(-Ea//RT)` the factor A is called frequency factor and since it is a coefficient of exponential expression, `e^(-E_(a)//RT)` it is also called pre-exponential factor. Inthe above equation k is a rate constant at temperature T, `E_(a)` is the energy of activation and R is a gas constant. A is related to frequency of COLLISIONS (Z) or rate of collisions. It is represented as, `A=PxxZ` where P is the probability of collisions with PROPER orientations and Z is the frequency of collisions of REACTING molecules . The units of A are same as that of k. |
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