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A 3.00-L tank contains air at 3.00 atm and 20.0oC. The tank is sealed and cooled until

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A 3.00-L tank contains air at 3.00 atm and 20.0oC. The tank is sealed and cooled until the pressure is 1.00 atm.
(a) What is the temperature then in degrees Celsius? Assume that the volume of the tank is constant.
(b) If the temperature is kept at the value found in part (a) and the gas is compressed, what is the volume when the pressure again becomes 3.00 atm?
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