Worksheet: Second-Order Reaction Half-Lives

In this worksheet, we will practice interpreting and converting between the half-lives and rate constants of second-order reactions.

Q1:

The decomposition of compound A is a second-order reaction with a rate constant of 2.420 L/mol⋅s. Calculate, to three significant figures, the half-life of this reaction when the concentration of A is 0.5000 M.

Q2:

The decomposition of compound A is a second-order reaction with a rate constant of 83.3 L/mol⋅s. Calculate, to 2 significant figures, the half-life of this reaction when the concentration of A is 5.99 mM.

  • A 5.6 s
  • B 3.6 s
  • C 2.0 s
  • D 2.9 s
  • E 6.0 s

Q3:

The decomposition of NOCl is a second-order reaction with a rate constant of 8.00×10 L/mol⋅s. Calculate the half-life of this reaction in minutes when the concentration of NOCl is 0.800 M.

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