Comment
Figure shows only the first heating and cooling processes. Sulfidation reaction starts at 160Ž, and finishes at 500Ž. There are two stages of reactionsi‚Pj160-225Ž,@peak at 186Ž@i‚Qj225-500Ž, broard reaction
Total enthalpy of reaction, ƒ’Hr=397.9J/g. Phase transition, at 528Ž,@98.6J/g, at 610Ž,@9.6J/g. Corresponding cooling peak at 441.4Ž,@80.6J/g.
The enthalpy of formation
@Product is the orthorhombic Sb2S3.
The enthalpy of formation is ƒ’Hf=43.9Kcal/mol.