4. (15 points) Co nsider the phase change between white-Sn(s) and gray-Sn(s). Wh

Question

4. (15 points) Co nsider the phase change between white-Sn(s) and gray-Sn(s). When white-Sn(s) is cooled at 1 atm to 286.35 K it undergoes a phase change to gray- (s). Given that the density of gray-Sn(s) is less than the density of white-Sn(s), would you expect the temperature of conversion from white-Sn(s) to gray-Sn(s) to be greater than or less than 286.35 K at a pressure of 2 atm? Answer by sketching out the phase boundary between the two solid phases based on the information that you have. (Hint: Just as with liquid/solid phase boundaries, higher pressure favors the phase with higher density for solid/solid phase boundaries, as well)

Explanation / Answer

As Described in Question whit tin convert to gray tin at 286.53 K at 1 atm but at 2 atm high pressure it required less temperature than 286.53 K becoz if pressure increase temperature required to convert to gray tin is less ..it is stable at lower temperature...at same temperature 286.53 K at high pressure 2 atm it convert to White tin (sn)

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