Worksheet: Orders of Reaction

In this worksheet, we will practice using a rate law to deduce the order of reaction for each reactant.

Q1:

Hydrogen reacts with nitric oxide to form nitrous oxide and water:

The rate law for this reaction is rate = 𝑘 [ N O ] [ H ] 2 2 .

What is the order of reaction with respect to nitric oxide?

What is the order of reaction with respect to hydrogen?

What is the overall order of reaction?

Q2:

Methanol ( C H O H ) 3 reacts with ethyl acetate ( C H C H C O O C H ) 3 2 3 via a transesterification reaction, producing methyl acetate ( C H C O O C H ) 3 3 and ethanol ( C H C H O H ) 3 2 :

The rate law for this reaction under certain conditions is rate = 𝑘 [ C H O H ] 3 .

What is the order of reaction with respect to methanol?

What is the order of reaction with respect to ethyl acetate?

What is the overall order of reaction?

Q3:

In an acid-catalysed reaction between compounds A and B at a temperature 𝑇 , compound A is the limiting reactant and compound B is in excess. The rate equation is given by rate = 𝑘 [ A ], where 𝑘 is a pseudo-first-order rate constant. Which of the following does not affect 𝑘 ?

  • A[ B ]
  • BpH
  • C 𝑇
  • D[ A ]
  • ESolvent type

Q4:

Nitrosyl chloride ( N O C l ) is formed by the reaction of chlorine with nitric oxide: The rate of formation of N O C l was measured at three different reactant concentrations:

[ N O ] ( M ) [ C l ] ( M ) 2 Rate (M/h)
0.500 0.500 1.14
1.000 0.500 4.56
1.000 1.000 9.12

Determine the order of reaction with respect to nitric oxide.

Determine the order of reaction with respect to chlorine.

Expressing concentrations in units of molar and times in units of hours, estimate, to 2 significant figures, the numerical value of the rate constant for this reaction.

Q5:

Nitrogen dioxide reacts with carbon monoxide to form nitric oxide and carbon dioxide, as shown. At 1 0 0 C , the reaction is second order with respect to N O 2 and zeroth order with respect to C O . Determine the rate law for this reaction.

  • ARate = 𝑘 [ N O ] [ C O ] 2 2 2
  • BRate = 𝑘 [ N O ] [ C O ] 2
  • CRate = 𝑘 [ C O ] 2 2
  • DRate = 𝑘 [ N O ] 2 2
  • ERate = 𝑘 [ N O ] [ C O ] 2 2

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