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3 marksRates of Reaction

CAPE Chemistry Unit 1 · 2017 · Paper 2 · Question 5(c)

The decomposition of gaseous nitrogen(V) oxide exhibits first-order kinetics and is represented by the equation 2N₂O₅(g) → 4NO₂(g) + O₂(g). A proposed mechanism for the reaction is made up of the following steps (W and Z are intermediates): N₂O₅ → W + O₂ W → Z + NO₂ Z + 2N₂O₅ → 3O₂ + N₂O₃

Use the information relating to the kinetics of the reaction to write the equation representing the rate determining step. Give a reason for your response. Equation: Reason:

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Other parts of this question

  1. 5(a)(i)Explain EACH of the following terms: Rate law[2 marks]
  2. 5(a)(ii)Explain EACH of the following terms: Order of reaction[2 marks]
  3. 5(b)(i)Write an expression for the rate law.[2 marks]
  4. 5(b)(ii)Write an expression for the OVERALL order of reaction.[1 mark]
  5. 5(b)(iii)The overall order of this reaction was found to follow second-order kinetics. Deduce the units of the rate constant for the reaction.[1 mark]
  6. 5(d)(i)Plot the data on the grid provided on page 17, circling the plotted points.[2 marks]
  7. 5(d)(ii)Using the graph in (d) (i), calculate the rate constant for the decomposition of nitrogen(V) oxide at 333 K, stating the appropriate units.[2 marks]

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