Chem_215_Lecture_3_Color - Reactions in open containers...

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Open Cup: Const. P E i E f Δ E For exothermic process q < 0: Define q p to be heat of reaction at constant pressure If a gas is produced, Δ V > 0 Since w = -P Δ V, work, w < 0 Reactions in open containers (Const. P) Δ E = q p + w
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Experimental Determination of the Specific Heat Capacity (S) of Lead (Pb) T Pb,i 100 o C Pb T w,f = T Pb,f T w,i
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Specific Heat Capacities (J/g o C) Water (liquid) 4.184 Methyl Alcohol 2.549 Ice 2.093 Steam 2.009 Benzene 1.750 Wood 1.674 Air (50 o C) 1.046 Aluminum 0.900 Glass (typical) 0.837 Iron/Steel 0.452 Copper 0.387 Silver 0.236 Mercury 0.138 Gold 0.130 Lead 0.128
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Bomb Calorimeter (an isolated system) System includes everything inside insulated container: Bomb, reactants, water, thermometer, stirrer…
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The Bomb Complete Apparatus Volume is constant: w = -P Δ V = 0 Pressure increases--we measure q v in a bomb calorimeter
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Determination of Heat Capacity of Calorimeter • Heat of combustion of benzoic acid (C 7 H 6 O 2 ) in 30 atm O 2 : q rxn = - 26.43 kJ/gram printed on bottle
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This note was uploaded on 09/10/2008 for the course CHEM 1732 taught by Professor Davis during the Fall '08 term at Cornell University (Engineering School).

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Chem_215_Lecture_3_Color - Reactions in open containers...

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