For substance a, the entropy of the solid at 98.36 k is 7.36 cal/molk, at this temperature it takes place the transition from one solid form to another, the transition heat is 284.3 cal/mol. the increase in entropy of the second solid modification is 98.36 k to 158.91 k and is 5.05 cal/molk; the temperature of 158.91 k is the melting temperature of the solid. the melting heat of the solid is 476 cal/mol. from the melting point to the boiling point, 188.07 k, the increase of entropy is 2.36 cal/molk and the heat of vaporization is 3860 cal/mol. a heat capacity from the boiling point to 298 k is 6.98 cal/molk to an atmosphere of pressure. to calculate the absolute entropy of a considering as ideal gas an atmosphere and 298 k.