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The rate law for the decomposition of N2...

The rate law for the decomposition of `N_2 O_5` is: rate `= [N_2 O_5]`. What is the significance of k in this equation?

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k represents the rate constant or specific reaction rate for the reaction and is equal to the rate of reaction when concentration of `N_2 O_5` is 1 mol `L^(-1)`.
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