Question

Select all that apply. The rate law for the reaction 2NO(g) + Cl2(g) → 2NOCI(g) is given by R-k[NO][C121 If the following is the mechanism for the reaction, NO(g) + Cl2(g) → NOC12(g) NOCI,(g) + NO(g) → 2NOCI(g) which of the following statements accurately describes this reaction? Check all that apply. 2nd order reaction The first step is the slow step. Doubling [NO] would quadruple the rate. Cutting (Cl) in half would decrease the rate by a factor of two. The molecularity of the first step is 1. Both steps are termolecular. O O

Answer 1

Ans)

The Rate law for the reaction
2 NO(g) + Cl2(g) → 2 NOCl(g)

is: Rate = k [NO][Cl2] : n = order of reaction = 1 + 1 = 2 = 2nd order overall.
Following is the mechanism for the reaction
k1
NO(g) + Cl2(g) → NOCl2(g)

k2
NOCl2(g) + NO(g) → 2NOCl(g)

Statements that accurately describe the reaction are:

1- It is 2nd order reaction (Rate = k [NO][Cl2] : n = order of reaction = 1 + 1 = 2 = 2nd order overall.)

2- The first one is the slow step ( The first one is the slow and rate determining step)

3- Cutting Cl2 by half would decrease rate by factor of 2 .( From the rate law expression, it is clear that rate is directly proportional to concentration of Cl2)