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For a first order reaction the half life is

  • A.independent of the initial concentration
  • B.proportional to the initial concentration
  • C.inversely proportional to the initial concentration
  • D.proportional to the square of the initial concentration

Answer: A

It equals the logarithm of two divided by the rate constant, with no concentration term. This is a useful diagnostic, since a half life that changes with starting concentration rules first order out. The logarithm of two divided by k is the value.

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