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http://en.wikipedia.org/wiki/Hess%27s_law
http://www.science.uwaterloo.ca/~cchieh/cact/c120/hess.html
http://chemwiki.ucdavis.edu/Physical_Chemistry/Thermodynamics/Thermodyna...
http://www.chemguide.co.uk/physical/energetics/sums.html
http://www.chemteam.info/Thermochem/HessLawIntro1a.html
http://www.chemteam.info/Thermochem/HessLawIntro1.html
http://courses.washington.edu/bhrchem/c152/Lec04.pdf
https://www.ugdsb.on.ca/uploadedFiles/cddhs/teachers/stewart/Hess%20Law.pdf
http://smkh.ycdsb.ca/teachers/AGatto/SCH4U1/160CF23D-0119EDCC.82/Hess%27...
http://mail.avon.k12.ct.us/~mburgess/FOV1-00028E08/FOV1-0002DA6D/Hess%27...
http://www.chemistry-teaching-resources.com/Higher_Unit_3_Notes_files/He...
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