1_Show that bimolecular reactions between nonlinear molecules are much slower th

Question

1_Show that bimolecular reactions between nonlinear molecules are much slower than those between atoms even when the activation energies of both reactions are equal. Use transition state theory and make the following assumptions. Al vibrational partition func tions are close to unity. (2) All rotational partition functions are approximately 1 x 10^1.5 which is a reasonable order of magnitude number(3) The translational Partition function for each species is 1x 10^26

2 -Calculate the rate constant of the diffusion-controlled recombination of two atoms in benzene at 298 K. Assuming the concentration of the reacting species is 1.8×10^-3 M initially how long does it take for the concentration of the atoms to fall to half that value? Assume the reaction is elementary?

Explanation / Answer

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The number of molecules that participate as reactants in an elementary step defines the molecularity of the step. If a single molecule is involved, the reaction is said to be unimolecular. The rearrangement of methyl isonitrile is a unimolecular process. Elementary steps involving the collision of two reactant molecules are said to be bimolecular. The reaction between NO and O3 is bimolecular. Using the Quasi-equilibirum assumption, the time required for the nonlinear bimolecular reaction to realign to form the activated complexes is greater than the time it took to an lineal atom reaction to make this complexes.

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