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The concentration of CO2 in a soft drink under a pressure of 2.3 atm is 0.071...

The concentration of CO2 in a soft drink under a pressure of 2.3 atm is 0.071 M. Calculate the concentration of CO2 in a soft drink after the bottle is opened and equilibrates at the same temperature under a CO2 partial pressure of 3.0 x 10-4atm.

The answer is 9.3 * 10^-6 M but I don't know how to start this problem. Pls help!

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