The standard molar enthalpy of vaporization of ammonia is 23.35
kJ/mol at its standard boiling point of -33.4oC. The
standard molar absolute entropy of gaseous ammonia is 192.77 J/mol
K.
Calculate the standard molar Gibbs Free Energy for the
vaporization of ammonia at 15.0oC and calculate the
pressure of the gas phase of ammonia in equilibrium with liquid
ammonia +15.0oC. (We would call this the vapor pressure
of ammonia at +15.0oC.)