UCSB Science Line
Sponge Spicules Nerve Cells Galaxy Abalone Shell Nickel Succinate X-ray Lens Lupine
UCSB Science Line
How it Works
Ask a Question
Search Topics
Our Scientists
Science Links
Contact Information
Can you explain to me Hess' Law?
Question Date: 2009-11-23
Answer 1:

Wikipedia has an interesting explanation of Hess Law.

Basically Hess Law states that the measurement of the energy content of a system (called enthalpy) change in a reaction is equal to the sum of the enthalpy changes of the individual steps of the process. If you measure the energy content of a system change, it will be the same either it takes place in one big step or in many small ones. We can say in different words that if you go from a particular set of reactants to a particular set of products, the enthalpy change is the same, whether the reaction takes place in one step or a series of steps. This means that the enthalpy is a state function.

Click Here to return to the search form.

University of California, Santa Barbara Materials Research Laboratory National Science Foundation
This program is co-sponsored by the National Science Foundation and UCSB School-University Partnerships
Copyright © 2017 The Regents of the University of California,
All Rights Reserved.
UCSB Terms of Use