Given n (CO2) = 1.041 mol, V (CO2) = 1.016
L and T (CO2) = 270 .0 K
Pideal = 22.70 atm
Now we will calculate pressure using van der Waals equation
(P + an2/V2) (V - nb) = nRT (Here
R is gas constant)
Rearranging the equation,
Preal = (nRT/V - nb) -
an2/V2
Substitute the all given values and calculate P
Preal = (1.041 x 0.08206 x 270 / 1.016 - 1.041 x
4.267×10-2) - 3.5x(1.041)2 /
(1.016)2
Preal = 20.07 atm
Percentage difference = [(Pideal - Pvan der
Waals) / P ideal ] x 100
                               Â
= (22.70 - 20.07 / 22.70) x 100
                               Â
= 11.58 %
