The van der Waals equation compensates for non-ideal behavior of gases by taking into account intermolecular forces and the volume of the gas molecules. For CO, a = 1.505 L²atm/mol² and b = 0.03985 L/mol. Use the van der Waals equation to determine the pressure, in atmospheres, of 1.5 moles of CO gas in a 3.00 L flask at 25.0°C. Remember the gas constant, R, is 0.08206 L･atm/mol･K.

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