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Thermo+Kin+Lecture+7withSolns

# Thermo+Kin+Lecture+7withSolns - Sample Problem 1 Determine...

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Sample Problem 1: Determine Enthalpy of Formation We would like to add to the number of biochemical species for which data are available in the tables at the end of the textbook. To determine the enthalpy of formation of benzoic acid, 1 mole of benzoic acid is completely burned with an excess of oxygen according to the reaction C 7 H 6 O 2(s) + 7.5O 2(g) -> 7CO 2(g) + 3H 2 O (l) All reactants are originally at 25 ° C, and the system is allowed to cool back to 25 ° C after the products have formed. The initial and final pressures are 1 atm. The heat released from the system is measured to be 772 kJ. Other relevant information: H ° for(O2(g)) = 0 kJ/mol, H ° for(CO2(g)) = -393.5 kJ/mol, H ° for(H2O(l)) =-285.8 kJ/mol, H ° for(H2O(g)) =-241.8 kJ/mol. 1. What is the H ° reaction ? 2. What is the enthalpy of formation of benzoic acid? 3. What is the H ° reaction if the product H 2 O appears as gas instead of liquid? Lecture 7

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Sample Problem 2: Bioreactor Consider a thermophilic bacterium that converts glucose into acetic acid by the overall reaction: C 6 H 12 O 6 (s) + 2 O 2 (g) Æ 2 CH 3 COOH (l) + 2 CO 2 (g) + 2 H 2 O (l) a) Calculate H° for this reaction at 80°C and 1 atm.

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