That's the important message, delta H of formation of the products, minus delta H of formation of the reactants.

去反应物的生成焓，这,是个重要的信息，生成物的生成焓,减去反应物的生成焓。

麻省理工公开课 - 热力学与动力学课程节选

So we're just subtracting, in effect, zero, right, from the enthalpy of the product, but of course it's important have that established because the heat of formation is something you could measure, right?

所以从效果上说，我们只是，从生成物的焓中减去了零，但，是确立这一点很重要,因为生成热是,你能测量的东西，对吧？

麻省理工公开课 - 热力学与动力学课程节选

It's a state function. If we know the enthalpy of the products minus the enthalpy of the reactants, right. It's a state function.

如果我们知道生成物的焓减,去反应物的焓的值,它是个态函数，原则上我们可以做到。

麻省理工公开课 - 热力学与动力学课程节选

In other words, we choose a convention for the zero of entropy, so that then we can write entropies of products and reactants always referring to the same standard state.

换句话说，我们选择了一个,焓零点的约定，这样我们,就可以总是相对于同样的标准,状态写出生成物和反应物的焓。

麻省理工公开课 - 热力学与动力学课程节选

Delta H of formation means the enthalpy of this compound minus the enthalpy of its constituent elements in their most stable state at room temperature and pressure.

生成焓就是这种组分,的焓减去它的所有组成元素,在室温和常压下处于,其最稳定的状态时的焓。

麻省理工公开课 - 热力学与动力学课程节选

And if I do that then I can find out the change in enthalpy of this reaction. It's just going to be the heat of formation of these three moles of water, minus the heat of formation of the iron oxide. OK.

我就能得到这个,反应的焓的变化,它就是三摩尔水,的生成热，减去氧化铁的,生成热，好。

麻省理工公开课 - 热力学与动力学课程节选

It's delta H of formation of the products minus delta H of formation of the reactants.

反应的△H是多少？,它就是生成物的生成焓减。

麻省理工公开课 - 热力学与动力学课程节选