How To Calculate The Steric Factor For an N2O5 Molecule

Assignment Task

1. The reaction of interest:
OH(g) + H2(g) → H2O(g) + H(g)

The reaction is known to have an experimental k = 3.48 x 103 M-1s1 at 298 K and
4.32 x 104 M1s1 at 350. K. What is the probability that a collision between OH and H2 will have the correct orientation for a reaction to go forward (at 350. K)? Use collision theory for this calculation. Show all work.

Assume OH has a radius of 0.32 nm and H2 has a radius of 0.29 nm.
OH has a molar mass of 17.01 g/mol. H2 has a molar mass of 2.016 g/mol

2. The decomposition of N2O5 is known to be first order with a t1/2 = 2.81 hrs at 298 K. It is known that an N-O bond with an energy of 201 kJ/mol is broken for this reaction to occur. N2O5 is a polyatomic molecule. Using RRK theory, calculate the steric factor (P) for an N2O5 molecule with an energy of 350 kJ/mol.

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