Question

copper melts at 1083 oc. at 1100 oc free energy of molten copper with respect to free energy of copper in solid state is

Answer 1

Solid copper melts at 1083 celcius when its temperature increases from 25 celcius at room temperature after which it will remain in molten state up to 100 celcius as follows:

For melted copper latent heat is required which is 13.06 kJ /mol whereas for solid copper specific heat is 0.38 J /gK .

Solid Cu

Q = msdT + mL

= 1 (0.38) (1083-25) +1 (13.06) = 13.408 kJ /mol

Melt Cu,

Q = mL

= 1 (13.06) = 13.06 kJ/mol

Free energy for 1g liquid copper is 13.06 kJ/mol is higher than solid copper with free energy value 13.408 kJ /mol.

Thus, free energy for 1g liquid copper is 13.06 kJ/mol is higher than solid copper with free energy value 0.408 kJ /mol