CHEM 1110 1st Edition Lecture 15Outline of Last Lecture I. Enthalpies of reaction II. Calorimetry Outline of Current Lecture I. Hess’s Law of Heat Summation II. Enthalpies of Formation III. Foods and Fuels Current LectureI. Hess’s Law of Heat Summation A. If a reaction is carried out in a series of steps, delta H for the overall reaction equals the sum of the enthalpy changes for the individual steps.II. Enthalpies of Formation A. An enthalpy of formation, is defined as the enthalpy change for the reaction in which a compound is made from its constituent elements in their elemental forms B. Standard Enthalpy of Formation 1. Arbitrary reference point (because H can’t be measured)2. One mole of compound from elements at 1 atm3. Delta H = 0 for an ELEMENT in its standard form at 25 degree CThese notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.4. The standard state of a substance is its pure form at atmospheric pressure (1 atm) and a temperature of interest, usually 298 K.III. Foods and Fuels A. Metabolism = multi-step, low temperature version of
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