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You have a tank of compressed helium that has a volume of 12 L and a...

You have a tank of compressed helium that has a volume of 12 L and a pressure of 12 atm. You filled party balloons that hold 3 liters each, here in San Francisco. How many party balloons could be filled? The temperature and n are constant. Remember the tank holds 12 L of helium even at atmospheric pressure.
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