An element exists in two solid phases labelled p1 and p2the, Ask an Expert

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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^-1and 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?

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