None. The gas hasn't had a chance to effervesce out of the liquid since the solution is still contained.
Source(s):
http://en.wikipedia.org/wiki/Carbonation

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Zero they form after you open it
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The gas for the bubbles are always in the can, it's just that it is inside the liquid while the can is closed.

If you were to look inside a closed coke can, you would only see the dark coke liquid, no bubbles.

What actually causes the bubbles to form is the change in "atmospheric pressure" or the difference between the pressures inside the can when it is opened, and outside the can.

When you open a can, the gas inside the liquid coke comes rushing out and creates the bubbles.

If you were to open the can in a place where the atmospheric pressure was the same in as inside of the can, you would not see any bubbles.
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If it hasn't been shaken, the answer is zero. The air at the top is not a bubble.
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Thereis no bubbles before the can is open, the co2 is in solution under pressure, the bubbles appear only when the pressure drops after opening the can
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As it was stated in this topic before, there are no bubbles in the coke before you open it (take a plastic or glass coke bottle and you'll see). The reason that bubbles form is more complicated than merely opening and a pressure differential, though that is the onset. The process is called nucleation and is used a fair bit in meteorology and materials industry.

If you absolutely want to count "bubbles" I guess you can proceed the following way:
The gas floating on top of the coke must be under higher-than-atmospheric pressure and be composed of coke vapour, CO2 gas and air (unless it's bottled in vacuum).
We assume it was bottled at room temperature (no point in refrigerating pre-bottled coke, at least not that I know of). With that, we can estimate the number of moles of air (or rather, the different components of air) given the volume available for air before the can is sealed.
If we were to measure the pressure inside the bottle at room temperature, we would be be able to find out what volume of the gas is not from air (through PV = nRT, we had just calculated n, then using P, R and T we find the volume of air. The gas' volume minus the volume of air gives what's left).
Using this, we'll suppose that the vapour pressure of coke is the same as the vapour pressure of water. Coke is mostly water, after all. Once we account for the volume of water/gas vapour in the gas, the remaining volume must come from CO2 from the coke (minus the negligible CO2 content of air).
If you were to know the bottling concentration of CO2, you subtract from the bottled moles of CO2 the moles you found hovering over the coke in the gas; what is not in the gas is dissolved in the coke.

Thus, you take the molar amount of CO2 that has to still be dissolved (after accounting for the gas over the coke, that is) and multiply it to get how many individual molecules you have. If you want to consider that a bubble, then there you go.
Source(s):
http://en.wikipedia.org/wiki/Arhenius_equation
http://en.wikipedia.org/wiki/Nucleation
http://en.wikipedia.org/wiki/Ideal_gas_law

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The amount of carbon dioxide injected into a can of coca cola is a trade secret and hence this question can not be answered with precision. It has been estimated that each 12oz can of typical soda is injected with between 36 and 48oz of CO2 at atmospheric pressure. There are multiple variables which affect bubble size, including coca cola temperature and the depth of coca cola in the serving vessel. Coca cola bubbles have been estimated to have a diameter of 3/16 of an inch.

Using the above numbers and skipping all the boring mathematics the answer is: 21,208 bubbles

and, yes coca cola bubbles do contribute to global warming.
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Since a can of coke is not fully filled during canning, the small unfilled space gets filled with carbon dioxide that escapes or effervesces from the coke liquid. This pocket of gas in turn goes to fill bubbles created by internal friction forces. With the normal gas pocket measuring approximately 14 milliliters, and the lower size limit of an unreleased bubble being 0.03 milliliters, there are at most 467 bubbles inside a can of coke with a 95% probability.
Source(s):
Guesstimate

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