But what if you don't know the standard free energies of formation for the products and reactants?

但是，如果您不知道产物和反应物的标准生成自由能怎么办？

Today, we call this Gibbs free energy or sometimes the standard free energy or simply free energy of the system.

今天， 我们称其为吉布斯自由能或有时称为标准自由能或简称为系统的自由能。

The standard free energy change of formation for a compound, then, is just the difference between its standard free energy and that baseline.

那么，化合物的标准自由能形成变化就是其标准自由能与基线之间的差异。

So scientists created a baseline by setting the standard free energy change of formation for an element in its most stable form at standard state to zero.

因此，科学家通过将标准状态下最稳定形式的元素的标准自由能形成变化设置为零来创建基线。

The standard free energy of formation, written like this, is the change of free energy that occurs when a substance is formed from its elements at a standard state.

标准形成自由能， 这样写，是物质在标准状态下由其元素形成时发生的自由能变化。