At 900 K, solid Sr has values of enthalpy and entropy of 20.285 [kJ/(mol)] and 91.222 [J/(mol K)], respectively. At 1500 K, liquid Sr has values of enthalpy and entropy of 49.179 [kJ/mol]
and 116.64 [J/(mol K)], respectively. The heat capacity for the solid and liquid phases is given by:

respectively. Using only these data, determine the temperature of the phase transition between solid and liquid. What is the enthalpy of fusion? The result of Problem 6.25 could be useful.

Problem 6.25

At 922 K, the enthalpy of liquid Mg is 26.780 [kJ/mol] and the entropy is 73.888 [J/(mol K)].
Determine the Gibbs energy of liquid Mg at 1300 K. The heat capacity of the liquid is constant over this temperature range and has a value of 32.635 [J /(mol K)].

Transcribed Image Text:

(cp)sr= 37.656 [J/(mol K)] and (cp)sr= 35.146 [J/(mol K)]