The Gibbs energy of the system with a solid and a liquid phase can be written as: Gm=Gmsolid+(1)Gmliquid with representing the mole fraction of the solid phase and denoting the state of the system. a) Calculate the driving force for the transformation from liquid to solid, i.e. the change of , above and below the melting temperature, respectively, and plot it as a function of temperature. (10pt) b) Discuss what transformation will take place at temperatures above and below the melting temperature based on the sign of the driving force. (10pt)