Entropy for Phase Transitions

Entropy is

Explain the following terms: (i) Enthalpy of formation (ii) Enthalpy of combustion (iii) Enthalpy of phase transition.

Entropy Change During Phase Transitions

Assertion:Phase transition involves change in internal energy only. Reason:Phase transition occurs at constant pressure.

If the enthalpy change for the transition of liquid water to steam is 300kJ mol^(-1)" at "27^(@)C , the entropy change for the proces would be

If the enthalpy change for the transition of liquid water to steam is 30 kJ mol^(-1) at 27 ^(@)C , the entropy change for the process would be