Lec-04-Chap05-4-bare - Lec-04-Chap05-4-bare Lec-04 Chemical...

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Lec-04-Chap05-4-bare 9/9/2011 Standard Enthalpies of reaction Enthalpies of formation. Calorimetry, etc. 1 Lec-04: Chemical Thermodynamics Chapter 5 - Continued 1 Enthalpy Changes: Chemical Processes       2 2 -1 2 1 H g O g H O 241.8kJmo 2 l g H    Δ H reaction at 25 ° C and 1 bar: standard enthalpies of reaction Δ H ° 2 Enthalpy , like energy , mass, and volume , is extensive .     -1 2 2 -1 2 2 2 2 2 H g O g 2H O g 1 H g O g 2 reactio 48 n 1 3.6 H O g kJ m 241.8kJ mo ol reaction 2 2 l H H H H      For any given transformation: (initial) → (final) The reverse process is: (final) → (initial) -1 2 2 1 2 2 2 - 2 241.8kJ mol 1 H O g H g O g 241.8k exothermic endothermi J mol 1 H g O 2 c g H O g 2 H H     
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