Consider the following statements pertaining to Clapeyron equation:

1. It is useful in estimating properties like enthalpy from other measurable properties

2. At a change of phase, it can be used to find the latent heat at a given pressure

3. It is derived from the relationship

Which of the above statements are correct?

Concept:

Clausius-Clapeyron equation is a relationship between the enthalpy of evaporation, saturation pressure and temperature, and the specific volume of the two phases involved.

This equation can be derived from Maxwell equation:

P is the pressure, T is the temperature, v is the specific volume and s is the specific entropy

During phase change the pressure and temperature are dependent properties

During phase change 

This equation is useful to find out the latent heat at the change of phase for a given pressure.