Chemistry / Chem 0729 · Capstone · 2–3 minutes
Capstone: From Calorimetry Data to a Hess's-Law Enthalpy Change
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This capstone combines a calorimetry measurement, the sign convention for enthalpy change, and the summation form of Hess's law into one complete thermochemical analysis.
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Treating the calorimeter's measured heat and the Hess's-law calculated value as needing to match exactly, rather than agreeing within the coffee-cup calorimeter's known imprecision, misreads what an idealized reference calculation can promise against a real measurement.