A rigid tank contains propane at 350 K and an unknown pressure. As the tank cools to 303 K, the vapor begins to condense. Estimate the initial pressure in the tank using the Peng-Robinson equation of state.The critical properties and acentric factor of acetone are Tc = 369.9 K and Pc = 42.5 bar and = 0.153. The vapor pressure is given by log10^sat = 4.53678 1149.36 / (+24.906) where P is in bar and T is in K.