Problem $2$: Multicomponent $P_{\text{d}\text{e}\text{w}}$ Calculations

Use the Peng$-$Robinson equation of state for mixtures $($PrFug$.$xlsx$)$ to determine the dew pressure and the liquid composition at $50C$ for a mixture that has the following mole fractions:

n$-$hexane: $0\mathrm{.}45$

n$-$octane: $0\mathrm{.}45$

isobutane: $0\mathrm{.}10$