Question

How would we represent the formation of carbon dioxide with DIFFERENT carbon isotopes?

Answer 1

Isotopomeric carbon dioxide?

Explanation:

`""^12C+O_2 rarr ""^12CO_2`

`""^13C+O_2 rarr ""^13CO_2`

`""^14C+O_2 rarr ""^14CO_2`

`""^12C+""^16O=""^(18)O rarr ""^16O=^12C=""^(18)O`

You could do the same thing with the isotopes of oxygen. Of course, "natural" carbon dioxide contains all of these isotopes to one extent or another.