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A mixture of 2 moles propane (1), 3 moles butane (2), and 5 moles pentane (3) is contained at 30 bar and 200°C. The van der Waals constants for these species are
Species
a3Jm3mol22 4
b 3m3/mol 4
Propane
0.94
9.06 3 1025
Butane
1.45
1.22 3 1024
Pentane
1.91
1.45 3 1024
Determine the fugacity and fugacity coefficient of propane using the following approximations
(a) the Lewis fugacity rule
(b) the virial form of the van der Waals equation truncated to the second term
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