11.120   Methane flows isothermally and without irreversibilities through a horizontal pipe operating at steady state, entering at 50 bar, 300 K, 10 m/s and exiting at 40 bar. Using data from the generalized fugacity chart, determine the velocity at the exit, in m/s.

11.121   Determine the fugacity, in atm, for pure ethane at 310 K,

20.4 atm and as a component with a mole fraction of 0.35 in an ideal solution at the same temperature and   pressure.

11.122 Denoting the solvent and solute in a dilute binary liquid solution at temperature T and pressure p by the   subscripts 1 and 2, respectively, show that if the fugacity of the solute is proportional to its mole fraction in the solution: f2 5 ky2, where k is a constant (Henry’s rule), then the fugacity of the solvent is f1 5 y1 f1 , where y1 is the solvent mole fraction and f1  is the fugacity of pure 1 at T,   p.