Unit 6 · Thermochemistry

Chapter 6.4

Enthalpies of Formation and Hess's Law

Some reactions cannot be run in a calorimeter, yet their heat is known to four figures. Heat changes add like stair steps, so a measurable route reaches the same landing.

in preparation · lesson 28 of 45

By the end

  1. 01Compute a standard enthalpy of reaction from tabulated enthalpies of formation
  2. 02Express an overall process as a series of component steps
  3. 03Combine step enthalpies with the reversing, scaling, and adding rules

In unit 6

  1. 6.1Endothermic, Exothermic, and How Heat Actually Moves
  2. 6.2Calorimetry and the Energy of Phase Changes
  3. 6.3Enthalpy of Reaction and Bond Enthalpies
  4. 6.4Enthalpies of Formation and Hess's Law
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