Frequency Factor a) What are the two components, Z and p, of frequency factor A

Question

Frequency Factor

a) What are the two components, Z and p, of frequency factor A of the Arrhenius equation?

b) For the reaction: A (g) + B (g) --> AB (g):
   i.) how many unique collisions between reactants A and B are possible if 5 particles of A and 2 particles of B are present in the vessel?
   ii.) how many unique collisions between reactants A and B are possible if 500.0 particles of A and 200.0 particles of B are present in the vessel?
   iii.) how many unique collisions between reactants A and B are possible if 1.01 mol of A and 2.12 mol of B are present in the vessel?

c) How does the second component of the frequency factor, p, explain why this reaction has a measurable rate and does not occur instantly?

Explanation / Answer

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What are the two components, Z and p of frequency factor A of the Arrhenius equation?

Z = collision frequency (larger number)
p = orientation factor (small number)
--- A = Zp ---

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How many unique collisions between reactants A and B are possible if 5 particles of A and 2 particles of B are present in the vessel?
A (g) + B (g) ----> AB (g)

5 x 2 = 10 unique collisions possible

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How many unique collisions between reactants A and B are possible if 1.01 mol of A and 2.12 mol of B are present in the vessel?
A (g) + B (g) ----> AB (g)

(1.01 mol) (6.023 x 10^23) / mol x (2.12 mol) (6.023 x 10^23) / mol = 7.77 x 10^47 unique collisions possible

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