a. Describe the meaning of the term thermodynamic equilibrium. Explain how entropy can be used as a measure of equilibrium and also how other properties can be developed which can be used to assess the equilibrium of a system.

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If two phases of a component coexist in equilibrium (e.g. liquid and vapour phase HO) show that .dp dT = Vg where T === temperature, p = pressure, 1 = latent heat and Vfg = difference between liquid and vapour phases Show the significance of this on a phase diagram. b. The melting point of tin at a pressure of 1 bar is 505 K, but increases to 508.4 K at 1000 bar. Evaluate -the change of density between these pressures and the change in entropy during melting. The latent heat of fusion of tin is 58.6 kJ/kg. [254,100 kg/m3; 0.1157 kJ/kg K]