One of the many ways in order to solve for the vapor pressure of pure components at a given temperature is through the Antoine's equation which is written below, P = 10^(A - B/C+T) where A, B, and C are constants and T is the temperature in °C and P is the vapor pressure in mm Hg. For hexane, A = 7.01 B = 1246.33 C = 232.988
Substituting the known values, P = 10^(7.01 - 1246.33/232.988+25) P = 151.199 mm Hg
