## View Poll Results: Can Carbon (atoms) be used to fight fire?

Voters
10. You may not vote on this poll
• Yes

7 70.00%
• No

2 20.00%
• Not Sure

1 10.00%

# Thread: How energy is given and taken form this process?

1. c + o2 --> CO2

How much energy is needed to start this process and how much energy it gives out when once the process has begun and ended?

I need the amount for 1 ATOM of Carbon + 1 Molecule of Oxygen NOT in grams.

2.

3. I'm here too.

Carbon is fuel for fire. It needs oxygen too (for combustion to occur). Maybe sometime this weekend I can calculate it for you, I just don't have time right now.

Maybe I can find the time to even explain the chemistry to you. It can all be explained with an understanding of spontaniety in reactions and Gibbs Free Energy.

4. The creation of CO2 from O2 and solid carbon releases 393 kJ/mol.

393000J / (6.022x10^23) = 6.5x10^-19 joules released when one CO2 molecule forms.

5. Originally Posted by Scifor Refugee
The creation of CO2 from O2 and solid carbon releases 393 kJ/mol.

393000J / (6.022x10^23) = 6.5x10^-19 joules released when one CO2 molecule forms.
Did you first used a large amount of carbon or charcoal and then calculated the the value for a single atom?

If that is the case, I am NOT convinced. What I need is how much energy will the reaction between one ATOM carbon and one Molecule CO2 will need t start and how much enery will be release once the reaction is over.

No chain reaction like when you burn a charcoal.

6. Well, if that calculation is is based on one mole you can simply divide it by 6.02 x 10^23 (Avagadro's Number).... ....

Actually Scifor Refugee has already done that. He has provided your number.

7. Originally Posted by silkworm
Well, if that calculation is is based on one mole you can simply divide it by 6.02 x 10^23 (Avagadro's Number).... ....

Actually Scifor Refugee has already done that. He has provided your number.
Is there concrite proof that C + O2 will produce this amount of energy or was it an assumption?

--------------------------
Sorry for mistake in Equation. Correction made.

8. Well, C + CO2 will do nothing (because there's no advantage in energy for the reaction to take place). C + O2 when given a spark will react spontaneously to give that per atom of carbon and molecule of oxygen. It is very well established, and this reasoning does not work just for this reaction but all reactions. I'm not going to hold your hand and walk you through it because it's actually pretty involved. I gave you a suggestion to study Gibbs Free Energy, which is a solid starting point.

9. Originally Posted by theorein
Did you first used a large amount of carbon or charcoal and then calculated the the value for a single atom?

If that is the case, I am NOT convinced. What I need is how much energy will the reaction between one ATOM carbon and one Molecule CO2 will need t start and how much enery will be release once the reaction is over.

No chain reaction like when you burn a charcoal.
Do you want to react a carbon atom with O2 or CO2? I assume you meant O2, like you said in your original post.

If you want to react a cloud of neutral single-carbon-atom gas with O2, it would release 114 kj/mole. That's the energy difference between the O2 double-bond and the two CO double bonds that form. There is more energy in the O2 bond than in the CO2 bonds, so you get a net energy release.

10. May I know who is the other person who voted YES and why?

11. There is less energy in the two carbon-oxygen bonds of CO2 than there is in the oxygen-oxygen bond of O2. So if you convert O2 and C into CO2, the energy has to be released.

12. Originally Posted by Scifor Refugee
There is less energy in the two carbon-oxygen bonds of CO2 than there is in the oxygen-oxygen bond of O2. So if you convert O2 and C into CO2, the energy has to be released.
But this is not a reason why it could be used as a fire extinguisher, correct? If it releases energy, then it would ADD to the fire.

I said, yes, it could be used to put out a fire, but the reason why is that if you poured a large amount of carbon onto a fire, it would smother it. I guess it is all a question of how you are trying to use the carbon to fight the fire.

13. my guess is that the combustion of carbon produces CO2, starving the fire of oxygen?

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