Elementary Principles 355

# Elementary Principles 355 - 9.4 (cont'd) U ro is the change...

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9- 3 9.5 9.6 9.7 c. a. b. a. b. a. b. c. d. Δ ± U r o 22 is the change in internal energy when 1 g- mole of CaC (s) and 5 g- moles of H O(l) at 25 C and 1 atm react to form 1 g - mole of CaO(s), 2 g - moles of CO (g) and 5 g- moles of H (g) at 25 C and 1 atm. D D QU nU v == = = Δ Δ CaC r o CaC 2 2 2 2 150 g CaC 1 mol 52.0 kJ 64.10 g 1 mol CaC 121.7 kJ ± Heat must be transferred to the reactor. Given reaction = (1) – (2) ⇒= = Hess's law r o r o r o Btu lb - mole ΔΔΔ ±±± , HHH 12 1226 18 935 bg = − 17 709 , B t u l b - m o l e Given reaction = (1) – (2) = −+ Hess's law r o r o r o Btu lb - mole ,, 121 740 104 040 = − 17 700 B t u l b - m o l e Reaction (3) () Hess's law o r kJ kJ kJ ˆ 0.5 (1) 2 0.5 326.2 285.8 122.7 mol mol mol H ⎛⎞ Δ= = ⎜⎟ ⎝⎠ Reactions (1) and (2) are easy to carry out experimentally, but it would be very hard to decompose methanol with only reaction (3) occurring. Ng Og 2 N O g +→ , ΔΔ ±± .. HH r o f o NO(g) kJ mol kJ mol Table B.1 F H G G I K J J = B 2 2 90 37 180 74 ej n + CH g 11 2 O g 5CO g 6H O l 51 2 2 2 Δ
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## This note was uploaded on 02/27/2012 for the course CHEMICAL E 312 taught by Professor Cheung during the Fall '11 term at The University of Akron.

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