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Question

What is the rate law for a first-order reaction?


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Solution

Rate Law:

  • It is an algebraic equation showing how the rate of the reaction depends on the molar concentrations of one or more reactants.

First-Order Reaction:

  • These are the reactions in which the rate of a reaction is determined by the variation of one concentration term only.

The rate law for a first-order reaction:

  • The rate law of first-order reaction states that the sum of the exponent is equal to 1.
  • “The reaction rate is directly proportional to the concentration of the reactants.”
  • A first-order reaction depends on the concentration of one reactant.
  • The rate law for a first-order reaction can be represented as:

k=2.303tlog10aa-x

  • Where ‘a’ is the initial concentration of a reactant, ‘x' is the number of moles per liter decomposing after time ‘t’ and ‘k’ is the rate constant for the first-order reaction.

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