Petrucci problems _1 answers - Chemistry 2080 Spring 2011...

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Chemistry 2080 Spring 2011 Answers to Petrucci Problem Set #1 3B The heat that is liberated by the benzoic acid's combustion serves to raise the temperature of the assembly. We designate the calorimeter's heat capacity by C: q q rxn calorim g kJ g kJ =1.176 26.42 1 = 31.07 = × q C t C C calorim kJ C kJ C kJ C = = 31.07 = 4.96 = 31.07 4.96 = 6.26 / Δ × o o o 4A The heat that is liberated by the reaction raises the temperature of the reaction mixture. We assume that this reaction mixture has the same density and specific heat as pure water. ( ) 3 calorim 1.00 g 4.18 J = 200.0 mL 30.2 22.4 C = 6.5 10 J= 1 mL g C rxn q q × × × × o o Owing to the 1:1 stoichiometry of the reaction, the number of moles of AgCl(s) formed is equal to the number of moles of AgNO 3 (aq) in the original sample. 3 3 1.00 M AgNO 1 L 1 mol AgCl moles AgCl = 100.0 mL = 0.100 mol AgCl 1000 mL 1 L 1 mol AgNO × × × 3 rxn 6.5 10 J 1 kJ = = 65. kJ/mol 0.100 mol 1000 J q
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Petrucci problems _1 answers - Chemistry 2080 Spring 2011...

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