Volume of 1 Mole O2 & CO2 at Same Temperature & Pressure

[Stephanus]

Dear PF Forum,

A:
1 mole O₂ is roughly 32 grams?
1 mole ozone is roughly 48 grams?
1 mole CO₂ is roughly 46 grams?
Considering there are isotopes
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B:
Do, at the same temperature and pressure, 1 mole CO₂ and 1 mole O₂ have the same volume?
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C:
At the same pressure, does the volume of 1 mole O₂ at 400K is 2/3 the volume of 1 mole O₂ at 600K?

I'm terribly sorry. I must have played truant at chemistry class

I have a composter. There two holes on it. One at the upper side, one at the lower side. The composting process is the reverse of photosynthesis. That is.
C₆H₁₂O₆ + 6O₂ -> 6CO₂ + 6H₂O
So it seems that the composter is "inhaling" oxygen and "exhaling" CO₂. If the volume of 1 mole O₂ is the same as the volume of 1 mole CO₂, then O₂ must be at the higher part and can enter the upper hole easily. And CO₂ will come out the lower hole.

 

[DrClaude]

A, B, and C are correct, but

The composting process is the reverse of photosynthesis. That is.
C₆H₁₂O₆ + 6O₂ -> 6CO₂ + 6H₂O

is not. That represents the combustion of sugar. For one, the composting material is not principally made of sugar. Also, composting is done by bacteria, so it is much more complicated than a simple chemical reaction. As you were told in another thread, there are for instance anaerobic bacteria that will decompose the organic matter in the absence of oxygen.

If the volume of 1 mole O₂ is the same as the volume of 1 mole CO₂, then O₂ must be at the higher part and can enter the upper hole easily. And CO₂ will come out the lower hole.

That's a non-sequitur: even if all you had written was correct, I don't see how this would follow. In addition, the compost will be at a higher temperature than ambient air, so most of it will escape from the top hole.

 

[Stephanus]

That's a non-sequitur: even if all you had written was correct, I don't see how this would follow. In addition, the compost will be at a higher temperature than ambient air, so most of it will escape from the top hole.

Thank you, thank you very much DrClaude.
So, how do we introduce the oxygen to the composter? Do the composter gets its oxygen from the material not from the air? Do we have to open the hatch occasionally?
Thanks for any reply. I'd like to do something for the environment. Perhaps if I know how to compost easily and correctly, I'll promote it to the people around me.