\text { Please determine } K_{i \cdot C_{4}} H_{10} \text { and } 50{ }^{\circ} \mathrm{C} \text { and } 150 \mathrm{kPa} \text { via (a) the DePriester Charts and (b) Raoult's Law w/ } Antoine's Eq. \ln \left(P_{i \cdot C_{4} H_{10}}^{\text {sat }}, k P a\right)=13.8254-\frac{2181.79}{t+248.870}