I bet above that temperature It will oxidize anything, just like fluorine. The partial pressure of the N2O would be very high. And since oxygen is
more electronegitive than chlorine, it may oxidize the Cu to CuO and release Cl2 and N2 gas. But 12-40 K is pretty achievable with liquid helium and
liquid nitrogen (Take the liquid nitrogen and cool it with liquid helium continuously to maintain to 12-40 K), and its surprisingly not too hard to
get, or so Ive heard. I could be an interesting low temperature oxidizer/chlorinator. If you can, try it out? See what its good for.
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