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Question

What is an instantaneous rate of reaction?


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Solution

Instantaneous rate of reaction:

  • The instantaneous rate is the rate of a reaction at a period of time that is so short that the concentrations of reactants and products change by a negligible amount.”
  • The instantaneous rate of reaction can be expressed as the rate of decrease in a concentration of reactants or the rate of increase in the concentration of products.
  • Consider a hypothetical reaction, RP
  • 1 mole of the reactant R produces 1 mole of the product P.
  • If [R]1 and [P]1 are the concentrations at time t1 while [R]2 and [P]2 are their concentrations at a time t2 then,

dt=t2-t1d[R]=R2-R1d[P]=P2-P1

  • The rate can be expressed as:

rinst=-d[R]dtorrinst=d[P]dt


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