A cylinder of nitrogen gas has a volume of 15,000 cm 3 and a pressure of 100

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A cylinder of nitrogen gas has a volume of 15,000 cm3 and a pressure of 100 atm.
a. What is the thermal energy of this gas at room temperature (20°C)?
b. What is the mean free path in the gas?
c. The valve is opened and the gas is allowed to expand slowly and isothermally until it reaches a pressure of 1.0 atm. What is the change in the thermal energy of the gas?

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