Class 12 Chemistry Chemical Kinetics Rate law

Rate law

  • The representation of rate of reaction in terms of molar concentration of the reactants participating in a reaction raised to some power is called rate law.
  • It is also called rate expression or rate equation.
  • Consider a reaction:

2NO (g) + O2 (g) --> 2NO2

Rate ∝ [NO]2

Rate ∝ [O2]

Combining these two rates we derive

Rate ∝ [NO]2 [O2]

Rate =k [NO]2 [O2]

  • Where k is the proportionality constant with a definite value at a specific temperature for a specific reaction and is called Rate Constant.
  • Rate law expression = -d[R]/ dt = k [NO]2 [O2]

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