Vapor pressure can be approximated by the Anotine-equation:

(here is p in bar and T in kelvin)

Constants in the Antoine equation:

Propane(C3H8): A = 4.0, B = 834, C = -23,

Butane(C4H10): A =4.7, B = 1200, C = -13

Find approximated values for saturated vapor pressure and the specific enthalpy of vaporization, h_fg, at 200 K for propane and for butane.

Tip: