Question

Question 7 1 pts The following two-step mechanism has been proposed for the gas phase decomposition of nitrous oxide: N20 (g) → N2 (g) + O (g) step 1 N20 (g) + O (g) - N2(g) + O2(g) step 2 Overall Reaction: 2 N20 (g) → 2N2 (g) + O2 (g) What is the molecularity of the first and second elementary steps of the mechanism? The first step is termolecular, and the second step is bimolecular, Both steps are bimolecular, The first step is unimolecular, and the second step is bimolecular The first step is bimolecular, and the second step is termolecular.

Answer 1

We know that molecularity is the number of species reacting to form new species in a elementary step.

Molecularity can neither be negitive or 0 or fractional.

It will always be a positive whole number.

So in first reaction there is only 1 reacting species. So unimolecular reaction

In 2nd reaction there are 2 species reacting hence it is called bimoleculer reaction.

Hence option 3rd is correct.