For an elementary reaction the temperature dependence of the

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For an elementary reaction the temperature dependence of the rate constant is given by the Arrhenius equation
K(T) =νe^(-Ea/RT)
where ν is called the preexponential factor (sometimes called prefactor) and Ea the activation energy (in kJ mol^(–1)).One can also express the activation energy in joules per single molecule (a very small number),provided one replaces the gas constant,R,by Boltzmann constant,k_B.
我想知道气体常数是怎么用Boltzmann常数来取代的

如果我们用Boltzmann constant来表示Universal gas constant R的话,activation energy 的单位就是joules per single molecule了.（一般非常小）
气体常数比Avogadro's constant就是 Boltzmann constant.（这一点你从dimensional analysis的角度很好理解,看看单位的变化）

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