New answers tagged molecules
The relevant term is the electron number density. So you can safely treat $\rm CO_2$ as "a thing" with $Z=22, A=44,$, mass 44 grams/mole (with more significant digits from a reference, if you like).
My best guess is that you would need to use a ultra high frequency played directly into a small body of water. Theoretically it could be done but actually doing it would be an immense task that I doubt anywhere other than the best lab could do
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