What is the molar heat of self-decomposition of nitric acid?

[James Essig]

TL;DR Summary

I am trying to find the molar heat of self-decomposition of nitric acid.

I am curious as to what is the value of the molar heat of self-decomposition of nitric acid.

I've searched online and cannot seem to find the above value.

Essentially, I am looking for the value for anhydrous nitric acid although I am aware that the acid is generally not provided in pure form due to its sensitivity to heat, shock, and bright light.

 

[Christopher Grayce]

The reaction you want is 4 HNO3(aq) -> 4 NO2(aq) + O2(g) + 2 H2O(l). You can probably calculate a decent heat of decomposition using the heats of formation of the compounds involved.