So, if we took the case of nitrogen, if we add an electron to nitrogen and go to n minus, we find that the change in energy is 7 kilojoules per mole.

如果我们以氮为例，如果我们给氮增加个电子令它变成-1价的氮，我们会发现能量的变化是，7，千焦每摩尔。

youdao

x So the mole fraction at any time is n minus x divided by the total number of moles, x which we just calculated as n plus x.

任何时候的摩尔分数是n减,除以总摩尔数，就是我们计算的n加。

youdao

So, if we took the case of nitrogen, if we add an electron to nitrogen and go to n minus, we find that the change in energy is 7 kilojoules per mole.

如果我们以氮为例，如果我们给氮增加个电子令它变成-1价的氮，我们会发现能量的变化是，7，千焦每摩尔。

麻省理工公开课 - 化学原理课程节选

Let's have one mole, n equals one.

因为是一摩尔，所以n等于一。

麻省理工公开课 - 热力学与动力学课程节选