Level: introductory
Reference: Germain Henri Hess, "Thermochemical research," Bulletin scientifique, Académie impériale des sciences (St. Petersburg) 8, 257-272 (1840)
Notes: This paper by Germain Henri Hess (1802-1850) contains data based on which he proposed the law to which we have attached his name. Reading it, or at least the excerpt of it available in Leicester & Klickstein's A Source Book in Chemistry, 1400-1900 and on the internet, is quite difficult for several reasons--despite some explanatory notes from the anthology editors. The formulas use an obsolete notation involving bars (signifying two atoms) and dots (signifying oxygen atoms); reactions are not specified in a manner easily recognized by a modern reader; and no units are given.
Solutions: To download solutions, go to:
http://web.lemoyne.edu/giunta/classicalcs/hess.doc
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