Chp3_calor

Chp3_calor - Calorimetry Calorimetry is the study of energy...

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Calorimetry Calorimetry is the study of energy transfer in the form of heat (q), which, at constant pressure, is the enthalpy ( H) or, at constant volume (bomb calorimeter), E. As discussed in section 3.9 of your text, the operating equation is based on treating the measuring device (calorimeter) as a thermodynamic “universe” so that: surr sys q q - = or, if we call the surroundings the calorimeter medium and the system our process or reaction of interest: cal rxn q q - = It is extremely important to recognize that the explicit sign here does NOT mean q rxn is negative. This “hard-wired” sign should be read as a “change sign flag”. Whatever the sign of q cal , q rxn has the opposite sign. Now, calorimetry problems can take all sorts of varieties based on this common starting equation depending on the nature of the “reaction” and the “calorimeter.” What is common are the following steps: Identify the nature or source of the enthalpy/heat transfer for the process and the
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Chp3_calor - Calorimetry Calorimetry is the study of energy...

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