Heat of Formation is a very powerful enthalpy used specially later on reaction and heating processes.

"Enthalpy of Formation" is based on a reference state (liquid, solids, gases, temperature allotrope, pressure, etc.)

Some rules are listed here

if you need more exercises check them out in the webpage!

Course is based on the next Texbook:

-Thermodynamics: An Engineering Approach by Yunus Çengel and
Michael Boles

Check out the Thermodynamic Course Playlist here:
http://goo.gl/JwCi0F

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