CHM 11600 Lecture 21: Hess’s Law

• School: Purdue University
• Department: Chemistry
• Course: CHM 11600
• Professor: Nash/ Wasserman

Document Summary

Chm 11600 - general chemistry - lecture 21_hess"s law. The enthalpy change of an overall process is the sum of the enthalpy changes of its individual steps. Dh, like e is a state function . Only interested in overall change in dh, not in the path taken to get there. Remember dh depends on the physical state. Standard enthalpy change, dho is change in enthalpy for a process in which the reactants and products are in their standard states. Defined as enthalpy change at 1 bar pressure and 25 c. All reactants and products are in their standard states .