NAMES:

1)  What is the pressure according to the van der Waal equation for 0.258 moles of hexane confined to a volume of 1.25 L at
400 K?  (a = 24.39 atm L² mol^-1 and b = 0.1735 L mol^-1)

                                                                                                                                     atm

What would you expect the pressure of hexane to be according to the ideal gas equation?

2)  In the Dumas method 0.08355 mole of ethanol was measured (at 100.0^oC) to be contained in a 262 mL volume.  Calculate the percent error as determined by the differences in the pressure calculated by the ideal gas law versus the van der Waal equation.   (a = 12.02 atm L² mol^-1 and b = 0.08407 L mol^-1)  (  [%_error] = (ideal-vdW)/vdW .  It is assumed that the van der Waal calculation, vdW, is the correct pressure. )