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A reaction is second order overall. What are the units of its rate constant when the rate is in moles per litre per second?

  • A.litres squared per mole squared per second
  • B.litres per mole per second
  • C.per second
  • D.moles per litre per second

Answer: B

Dividing the rate units by concentration squared leaves litres per mole per second. Checking the units of a rate constant is the quickest way to confirm the order it was fitted for. The exponent decides what units remain.

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