Notes on Chapter Nine

6 i 3114 h2 g 2 28584 kj mol d i h co bg c2

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Unformatted text preview: J mol o Hc1 1299.6 kJ mol (2) o Hc 2 28584 kJ mol . (3) 2CO 2 (g) + H 2 O(l) o Hc3 1559.9 kJ mol (1) 1 O 2 (g) H 2 O(l) 2 7 C 2 H 6 ( g) O 2 (g) 2CO 2 (g) + 3H 2 O(l) 2 H 2 (g) The acetylene dehydrogenation reaction is (1) + 2 (2) (3) Hess's law H ro o Hc1 2 b 1299.6 o Hc 2 o Hc3 g . 2( 28584) ( 1559.9) kJ mol 9- 4 . 3114 kJ / mol 9.10 a. bg C8 H 18 l 25 O 2 (g) 2 bg 8CO 2 g bg H ro 9H 2 O g 4850 kJ / mol When 1 g-mole of C8H18(l) and 12.5 g-moles of O2(g) at 25 C and 1 atm react to form 8 g-moles of CO2(g) and 9 g-moles of H2O(g), the change in enthalpy equals -4850 kJ. b. Energy balance on reaction system (not including heated water): Ek , Ep, W 0 Q U Q U o Uc o Hc 89.4 kJ LM RT M MM N o Uc ˆ H co g 75.4 10 3 kJ 21.34 C 1 mol 18.0 10 3 kg mol. C 2.01 g C 8 H 18 consumed 1 mol C 8 H 18 114.2 g 89.4 kJ o U c (kJ) 1 mol C8 H 18 i gaseous products i gaseous reactants OP PP QP 8.314 J 1 kJ 298 K mol K 103 J b8 g 9 12.5 5068 kJ mol % difference = o Hc b U co kJ mol 5079 kJ mol 5079 kJ mol c. 1.00 kg mH 2 O (Cp ) H 2 O(l) T g 75...
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This document was uploaded on 03/06/2014 for the course CHE 2172 at LSU.

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