Extinguishing a Flame with CO2

[mysteryperson]

Hi,

In my chemistry class, we are doing a special stoichiometry project in which have to find out how much carbon dioxide is needed to extinguish a flame from a small candle. I was not sure of the best amount of CO2 needed for this task, so I was wondering if anyone would happen to know the best amount of CO2 needed (in mL or in L).

 

Thanks in advance!

Edited February 14, 2017 by tiffanyjitan

[hypervalent_iodine]

Surely this is something you have to figure out as part of your assignment?

[mysteryperson]

Surely this is something you have to figure out as part of your assignment?

You're right , but unfortunately I do not quite know how to find this certain information.

Edited February 14, 2017 by mysteryperson

[Sensei]

You're right , but unfortunately I do not quite know how to find this certain information.

 

I am with hypervalent_iodine on this.

It's pretty weird question for chemistry lesson, as CO₂ is just disallowing access to Oxygen present in air.

Doesn't react with fuel nor Oxygen to be able calculate moles (L/mL, or so) of reactant(s) (as there is no reaction).

One CO₂ molecule could be "reused" multiple times... as long as is needed.. it just blocks access..

 

Maybe: what is size of flame? Then what is its volume + some tolerance around it? Then calculate number of moles of CO₂ inside...

Edited February 14, 2017 by Sensei

[hypervalent_iodine]

It is very vague as stated. I wonder if there are some parameters we are missing. For example, are you being asked to consider a flame in a space of defined volume? Are you assuming the the CO₂ has to completely fill this volume and displace atmospheric gases? Have you been learning about ideal gas laws in class?

[Danijel Gorupec]

Or is it maybe about CO2 concentration in 'air' that will no more support burning?

[John Cuthber]

If the candle is in a box, make sure you have enough CO2 to fill the box.