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PCAT Chemical Processes – Argon Gas Pressure

A sample of argon gas is initially contained in an 18-liter aluminum tank at a pressure of 90 atm. If half of the gas molecules are allowed to slowly escape from the tank, such that temperature does not change significantly, what is the pressure of the remaining gas?

A. 9 atm
B. 18 atm
C. 45 atm
D. 90 atm

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C is correct. Since the number of moles of gas is halved but the volume and temperature do not change, the ideal gas law may be simplified to determine the new pressure, such that:

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