From the phase diagram for a certain substance the following points on the equilibrium curves were obtained: Sublimation Point (41K, 0.038 kPa), Triple Point (44.4K, 0.148 kPa) and Vaporization Point (80.2K, 101.0 kPa). Calculate the melting H assuming that, in the T and P intervals of the problem, the phase change H are additive, are constant, and that the Clausius-Clapeyron equation is valid. Give the result in ( J/mol )