12. Tout en respectant la loi de Hess, manipule les réactions 1, 2 et 3 pour obtenir la réaction figurant dans l'encadré. De plus, calcule la variation de l'enthalpie de la réaction. C,H.(g) → C,H;(g) + 2 H;(g) RXN 1: C,H;(g) + 5/2 O:(g) → 2 CO:(g) + H,0(g) AH = - 470 kJ/mol RXN 2: H,0(g) → H;(g) + % O(g) AH = 142.5 kJ/mol AH = 566 kJ/mol RXN 3:2 CO(g) + 3 H,0(g) → C,H«(g) + 7/2 O:(g) %3D

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ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
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Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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While respecting Hess' law, manipulate reactions 1, 2 and 3 to obtain the reaction shown in box. In addition, calculate the change in the enthalpy of the reaction. C 2 H 6 (g)--> C 2 H 2 (g) + 2 H 2 (g)
12. Tout en respectant la loi de Hess, manipule les réactions 1, 2 et 3 pour obtenir la
réaction figurant dans l'encadré. De plus, calcule la variation de l'enthalpie de la
réaction.
C,H.(g) → C,H;(g) + 2 H;(g)
RXN 1: CH,(g) + 5/2 O2(g) 2 CO2(g) + H,O(g)
AH = - 470 kJ/mol
RXN 2: H,0(g) → H;(g) + ½ O:(g)
AH = 142.5 kJ/mol
RXN 3:2 CO2(g) + 3 H,0(g) → C,H.(g) + 7/2 O:(g)
AH = 566 kJ/Imol
Page
9 I 16
Q +
K
acer
Transcribed Image Text:12. Tout en respectant la loi de Hess, manipule les réactions 1, 2 et 3 pour obtenir la réaction figurant dans l'encadré. De plus, calcule la variation de l'enthalpie de la réaction. C,H.(g) → C,H;(g) + 2 H;(g) RXN 1: CH,(g) + 5/2 O2(g) 2 CO2(g) + H,O(g) AH = - 470 kJ/mol RXN 2: H,0(g) → H;(g) + ½ O:(g) AH = 142.5 kJ/mol RXN 3:2 CO2(g) + 3 H,0(g) → C,H.(g) + 7/2 O:(g) AH = 566 kJ/Imol Page 9 I 16 Q + K acer
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