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Use the ideal gas equation and the Van der Waals equation to calculate the pressure exerted...

Use the ideal gas equation and the Van der Waals equation to calculate the pressure exerted by 1.00 mole of Argon at a volume of 1.31 L at 426 K. The van der Waals parameters a and b for Argon are 1.355 bar*dm6*mol-2 and 0.0320 dm3*mol-1, respectively. Is the attractive or repulsive portion of the potential dominant under these conditions?

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