Thermochemical Properties of Interest

INTRODUCTION SCOPE OF THE CHAPTER, DEFINITIONS OF KEY TERMS AND SOURCES OF DATA A. Thermochemical Properties of Interest 

As has been the approach for the authors other reviews on organic thermochemistry (many of which are referenced throughout the current text) this chapter is dominated by discussions of the molar standard enthalpy of formation (also called heat of formation ) and written symbolically as Af77ni° (also as AHf or This chapter largely foregoes 

The temperature and pressure are assumed to be 25 °C ( 298K ) and 1 atmosphere or 1 bar (101,325 or 100,000 Pa), respectively. Enthalpies are always given in the thermochemist s preferred units of kJmol where 4.184 kJ equals 1 kcal by definition. The descriptors s, Iq, g and aq refer to solid, liquid, gas and aqueous, respectively. 

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