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2 July, 09:38

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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.

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Answers (1)
  1. 2 July, 09:43
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    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.
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