Question

Choose ALL correctanswer(s)
The rate law for the reaction 2NO(g) + Cl 2(g) → 2NOCl (g) is given by R=k[NO][Cl2]
If the following is the mechanism for the reaction,
NO(g) + Cl2(g) → NOCl2(g)
NOCl2(g) + NO(g)→ 2NOCl(g)
Which statements accurately describes this reaction? Check allthat apply
a) second order reaction.
b) The first step is the slow step.
c) Doubling [NO] would decrease the rate by a factor oftwo.
d) The molecularity of the first step is 1.
e) Both steps are termolecular.

Answer 1

Answer:

The correct answers  "a) second order reaction." and "b) The first step is the slow step."

Explanation:

Order of NO = 1

Order of Cl₂ = 1

Overall order = 1 + 1 = 2

∴ the order is a second order reaction

Mechanism of the given reaction:

NO(g) + Cl₂(g) → NOCl₂(g)  ....................... Slow Step

NOCl₂(g) + NO(g) → 2NOCl(g)  ................ Fast step

The first step is the determining step, which is the slow step

The incorrect statements are:

"c) Doubling [NO] would decrease the rate by a factor of two. "

        When the concentrations of [NO] is doubled, the rate of the reaction is increased by the factor of two.

"d) The molecularity of the first step is 1. "

        Since the overall reaction is 2, the molecularity of the first step is 2.

"e) Both steps are termolecular."

         No, because the first step is bimolecular step.