External Resourses

Chem1 Virtual Textbook - The First Law of Thermodynamics
Begins with excellent primer on the 1st Law of Thermodynamics and finishes with a clear explanation of the concept of enthalpy.

Chem1 Virtual Textbook - Molecules as energy carriers and converters
Excellent presentation of a crucial set of concepts. Highly recommended. Make sure that you understand this material!

Purdue University - Energy, Enthalpy, and the First Law of Thermodynamics
Beginning with fundamental thermodynamic principles, carefully builds to convey a good understanding of the difference between internal energy and enthalpy. Recommended.

HyperPhysics - Enthalpy