Elementary Principles 357

# Elementary Principles 357 - 9.10 a. C8 H 18 l + bg 25 O 2...

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9- 5 9.10 a. b. c. CH l 25 2 O g) 8CO g 9H O g kJ / mol 81 8 2 2 2 r o bg b g +→+ = ( ± Δ H 4850 When 1 g-mole of C 8 H 18 (l) and 12.5 g-moles of O 2 (g) at 25 ° C and 1 atm react to form 8 g-moles of CO 2 (g) and 9 g-moles of H 2 O(g), the change in enthalpy equals -4850 kJ. Energy balance on reaction system (not including heated water): ΔΔ Δ Δ EE W Q U n U kp ,, ± mol C H consumed kJ mol 8 c o =⇒ = = 0 b g (. C pHO ( l ) ) from Table B.2 kJ / mol. C 2 754 10 3 D −= = ×° × = Qm C T HO p HO ( l ) 22 1.00 kg 1 mol 75.4 10 kJ 21.34 C 18.0 10 kg mol. C kJ () . Δ 3 3 89 4 D QU U U =⇒ = ⇒= Δ Δ Δ 89 4 5079 . ± ± kJ 2.01 g C H consumed 1 mol C H (kJ) 114.2 g 1 mol C H kJ mol 8 8 c o 8 c o ±± . HU R T ii c o c o gaseous products gaseous reactants 3 kJ mol 8.314 J 1 kJ 298 K
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