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, as shown. H()+2NO()NO()+HO()222gggg

The rate law for this reaction is ๐‘˜[NO][H]22.

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 (CHOH)3 reacts with ethyl acetate (CHCHCOOCH)323 via a transesterification reaction, producing methyl acetate (CHCOOCH)33 and ethanol (CHCHOH)32. CHOH()+CHCHCOOCH()CHCOOCH()+CHCHOH()33233332aqaqaqaq

The rate law for this reaction under certain conditions is rate = ๐‘˜[CHOH]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-catalyzed reaction between compounds A and B at a temperature ๐‘‡, compound A is the limiting reactant and compound B is in excess. The rate equation is given by rate = ๐‘˜[A], where ๐‘˜ is a pseudo-first-order rate constant. Which of the following does not affect ๐‘˜?

  • A[A]
  • B ๐‘‡
  • CpH
  • D[B]
  • ESolvent type

Q4:

Nitrosyl chloride (NOCl) is formed by the reaction of chlorine with nitric oxide: 2NO()+Cl()2NOCl()ยทggg2 The rate of formation of NOCl 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. NO()+CO()NO()+CO()22gggg At 100โˆ˜C, the reaction is second order with respect to NO2 and zeroth order with respect to CO. Determine the rate law for this reaction.

  • ARate = ๐‘˜[NO][CO]2
  • BRate = ๐‘˜[NO]22
  • CRate = ๐‘˜[NO][CO]22
  • DRate = ๐‘˜[CO]22
  • ERate = ๐‘˜[NO][CO]222

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