HW10 - Department of Chemical Biochemical Engineering...

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Department of Chemical & Biochemical Engineering Rutgers, The State University of New Jersey 98 Brett Road Piscataway, NJ 08854 14:155:201 Chemical Engineering Analysis I Homework Assignment 10 (due 12/9/08) 1. The standard heat of the combustion reaction of liquid n-hexane to form CO 2 (g) and H 2 O(l), with all reactants and products at 77°F and 1 atm, is " ˆ H r ° = –1.80 x 10 6 Btu/lb-mole. The heat of vaporization of hexane at 77°F is 13, 500 Btu/lb-mole and that of water is 18,900 Btu/lb-mole. (a) Is the reaction exothermic or endothermic at 77°F? Would you have to heat or cool the reactor to keep the temperature constant? What would the temperature do if the reactor ran adiabatically? What can you infer about the energy required to break the molecular bonds of the reactants and that released when the product bonds form? (b) Use the given data to calculate " ˆ H r ° (Btu/lb-mole) for the combustion of n-hexane vapor to form CO 2 (g) and H 2 O(g). (c)
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This note was uploaded on 06/22/2009 for the course CHEM 14:155:201 taught by Professor Buettner during the Spring '09 term at Rutgers.

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HW10 - Department of Chemical Biochemical Engineering...

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