Question

Consider the transition between two forms of solid tin, Sn (s, gray) → Sn (s, whilte). The two phases are in equilibrium at 18°C and 1 bar. The densities for gray and white tin are 5750 and 7280 kg m-3 , respectively, and the molar entropies are 44.14 and 51.18 J/(K·mol), respectively. a. Calculate the temperature at which the two phases are in equilibrium at 200 bar. b. Provide an approximate sketch of the phase boundary between gray and white tin in the temperature pressure phase diagram.