# Activation energy of chlorine trifluoride and hydrazine

Chlorine trifluoride was once tested in a rocket engine as an oxidizer for hydrazine. I am looking to simulate in software a rocket engine using this propellent combination. Activation energy is one of the inputs to the simulation software.

What is the activation energy of a chlorine trifluoride and hydrazine reaction?

$\ce{3 N2H4 + 4 ClF3 -> 3 N2 + 12 HF + 2Cl2}$

Is there a online chemistry source or book which might contain this value? If it has not been measured is there a way to calculate this value based on the properties of the chemicals involved? How to get the value is less important than a number I can enter into a text file.

Searching for papers on the subject mostly results in unrelated chemistry homework examples. The closest thing thing I found to an answer was looking up chemicals in the National Institute of Standards and Technology (NIST) Chemical Reactions Database. The database includes data for hydrazine reactions and chlorine trifluoride reactions separately, but not with each other.

$\ce{ClF3 -> *F + ClF2}$ reaction has $E_a = 118 \frac{kJ}{mol}$. Is it reasonable to assume this might be the first step if it is a radical reaction?

• Welcome to Chemistry.SE! Take the tour to get familiar with this site. This appears to be a homework question, please share your thoughts and attempts towards the solution, otherwise it might get closed. – pentavalentcarbon Jun 10 '17 at 2:58
• Do you really think someone was crazy enough to measure this? – Ivan Neretin Jun 10 '17 at 4:18
• In case it is a high order/concerted reaction the most realistic way to get it is from the literature. In case it is not it could be a radical reaction then the rate determining step most likely is a homolytic Cl-F cleavage. That one might be calculated with some effort to even realistic accuracy. – Rudi_Birnbaum Jun 10 '17 at 19:25
• Chlorine trifluoride is potentially the most dangerous substance ever. Please do not use it at home, or without EXTREME safety, especially when simulating a rocket engine. See the chemical spill many years ago, where 50 tons of this substance was dropped, and ate through more than a meter of concrete. – Equinox Jun 10 '17 at 19:44
• @Equinox And on that note, nor is hydrazine any good. – Sawarnik Jun 11 '17 at 21:57