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A first order reaction has a rate constant of 0.0693 per minute. What is its half life?

  • A.14.4 minutes
  • B.6.93 minutes
  • C.10 minutes
  • D.0.0693 minutes

Answer: C

The logarithm of two is about zero point six nine three, so dividing by the constant gives ten minutes. The two numbers are chosen so the arithmetic comes out cleanly and the relation is obvious. The relation holds only for first order.

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