The critical temperature of benzene is 289C and its critical pressure is 4.89 MPa. At 220C its

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The critical temperature of benzene is 289°C and its critical pressure is 4.89 MPa. At 220°C its vapor pressure is 1.91 MPa.

a. Calculate the fugacity of liquid benzene in equilibrium with its pure vapor at 220°C. 

b. Repeat the calculation for the case in which liquid benzene is under an atmosphere of hydrogen such that the total pressure is 13.61 MPa. The average density of liquid benzene at these conditions is 0.63 g/cc, and you can assume that hydrogen is insoluble in benzene at this temperature. The molecular weight of benzene is 78.02.

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