An element exists in two solid phases (labelled P1 and P2).

The standard molar entropies of P1 and P2  are21.9J mol^-1 K^-1  and 23.3J mol^-1 K^-1  respectively.

The standard Gibbs energy of formation of P1 is 0.0 kJ mol^-1  and that of P2 is  +0.15kJ mol^-1 at 298 K. 

(i) Which is the more stable polymorph at 298K?              

(ii) If the temperature is increased (at a constant pressure of 1 bar), at what  temperature will a phase transition occur between the two polymorphs?  

 

 

Posted Date: 3/22/2013 6:00:06 AM | Location : United States

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