The separation of isopentane from n-pentane by distillation is difficult (approximately 100 trays are required), but is

Question:

The separation of isopentane from n-pentane by distillation is difficult (approximately 100 trays are required), but is commonly practiced in industry. Using the extended Antoine vapor pressure equation, (2-39), with the constants below and in conjunction with Raoult's law, calculate relative volatilities for the isopentanel n-pentane system and compare the values on a plot with the following smoothed experimental values [J. Chem. Eng. Data, 8, 504 (1963)]:What do you conclude about the applicability of Raoult's law in this temperature range for this binary system? Vapor pressure constants for (2-39) with vapor pressure in kPa and Tin K are