Plot pressure against volume for 1 mol of

(a) Ideal gas molecules,

(b) Ammonia molecules, and

(c) Oxygen molecules, for the range V = 0.05 L to 1.0 L at 298 K. Use the van der Waals equation to calculate the pressures of the two real gases. Use a spreadsheet or the graphical plotter on the Web site for this book. Compare the plots and explain the origin of any differences you find.