We have a flash drum separating \(50.0 \mathrm{kmol} / \mathrm{h}\) of a mixture of ethane, isobutane, = and n-butane. The ratio of isobutane to n-butane is held constant at 0.80 (that is, Zic4/ZnC4 0.80). The mole fractions of all three components in the feed can change. If the flash drum operates at a pressure of 100.0 kPa, a temperature of 20.0C, and V/F = 0.40, what are the mole fractions of all three components in the feed? Use DePriester charts or Eq. (2-28).

Equations (2-28)

In K = a/T2+ a2 T + + pl In p + ap2/p + ap3/p