This is a bit of a trick question! Neither Mountain Dew nor Coke contain a significant amount of carbon dioxide.

Here's why:

* Carbon dioxide is a gas: It's what creates the fizz in soda. The carbon dioxide is dissolved into the liquid under pressure.

* The amount of carbon dioxide changes: The amount of carbon dioxide in a soda can vary depending on how it's stored and how long it's been open.

So, what about the *amount* of carbon dioxide?

It's impossible to say which has *more* carbon dioxide without knowing the exact conditions they are being stored in. However, in general, both Mountain Dew and Coke will have roughly the same amount of carbon dioxide.

Let me know if you have any other questions!