Problem- Question If 1.00 mol of argon is placed in a 0.500-L container at 21.0?C , what is the difference between the ideal pressure (as predicted by the ideal gas law) and the real pressure (as predicted by the van der Waals equation)?
For argon, a=1.345(L2?atm)/mol2 and b=0.03219L/mol.
Express your answer to two significant figures and include the appropriate units.