Draw the schematically Gibbs free energy $($G$)$ curve vs$.$ Temperature for all phases $($solid$,$ liquid and gas $)$ at

$1$ and $10$atm pressure and triple point pressure. Indicate the stable phase fields with temperature and

metastable equilibriums. b$)$ Calculate Enthalpy of Melting, vaporization, and sublimation from the unary

phase diagram below after using appropriate equation with relevant assumption