Since absolute enthalpy is unknowable though, we have to be measuring from a baseline, and that baseline is that individual elements' most stable form at standard state.

由于绝对焓是不可知的， 我们必须从基线开始测量，而该基线是单个元素在标准状态下最稳定的形式。

So there you go, the calorimetry formula gave an absolute enthalpy change of 6.2 kJ, while Hess's Law gives a change of 5.67 kJ. So, why the difference?

所以你走了，量热法公式给出了 6. 2 kJ 的绝对焓变， 而赫斯定律给出了 5. 67 kJ 的变化。 那么，为什么不同？