Which combination of compounds will yield a maximum amount of CO2 gas with minimal amount of residuals?

Question

I'm trying to figure out which combination of compounds will yield a maximum amount of CO2 gas with minimal amount of residuals. At this point I know that vinegar combined with baking soda will yield CO2, and that CH4 (methane) + 2O2 ---> CO2 + 2H2O. The methane one is interesting but requires burning it with pure O2, not an option. Vinegar + baking soda is preferred but require a lot of material. I'd like to produce ~ 1.0L @ 1ATM of CO2 gas from the reaction.

Thanks!

Answer 1

For the Methane you don't have to worry because this reaction occurs only with oxygen, no other compound in normal air will react with it and the molar ratio is the same so you will need

.04 mol. or 1 L of CH4 to get 1L of CO2

Baking Soda and Vinegar will produce CO2 but with a greater amount of residuals including  Sodium Acetate Na(O2C2H3) and water.

EDIT-

I used STP (0 °C  at roughly 1 atm.) for the volume conversion so if you're are doing this at room temperature the result may be different.

Answer 2

There certainly are a plethora of compounds made up primarily of Oxygen and Carbon, but I don't feel like looking them all up and comparing them right now. Vinegar and baking soda is clearly the most accessible option for most people. I don't see how it requires a lot of material more than any other compound.