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 ta given pressure.
3. It is derived from the relationship
$\left ( \frac{\partial p}{\partial v} \right )_{T} = \left ( \frac{\partial s}{\partial T} \right )_{T}$
Which of the above statements are correct?
a) 1 and 3 only (b) 2 and 3 only
c) 1 and 2 only (d) 1, 2 and 3