(i) Determine A,H° for the following reaction using the listed enthalpies of formation: 4CO(g) + 8H2(g) 3CH4(g) + CO2(g) + 2H2O(1) Given: A:H° (kJ) C(graphite) + ½O2(g) CO(g) -110.5 C(graphite) + O2(g) CO2(g) -393.5 H2(g) + ½O2(g) H20(1) -285.8 C(graphite) + 2H2(g) CH«(g) -74.8 (ii) Using the average bond energies given below calculate A,H for the target reaction in (i). Average Bond Energies (kJ mol") N-H C-H 413 391 N-N 163 H-H 436 O-H 463 C-C 348 C=C 614 N=N 418 O=0 495 C=C 839 N=N 941 799 C=N 616 C=N 891 C=O C=O 1072

(i) Determine A,H° for the following reaction using the listed enthalpies of formation: 4CO(g) + 8H2(g) 3CH4(g) + CO2(g) + 2H2O(1) Given: A:H° (kJ) C(graphite) + ½O2(g) CO(g) -110.5 C(graphite) + O2(g) CO2(g) -393.5 H2(g) + ½O2(g) H20(1) -285.8 C(graphite) + 2H2(g) CH«(g) -74.8 (ii) Using the average bond energies given below calculate A,H for the target reaction in (i). Average Bond Energies (kJ mol") N-H C-H 413 391 N-N 163 H-H 436 O-H 463 C-C 348 C=C 614 N=N 418 O=0 495 C=C 839 N=N 941 799 C=N 616 C=N 891 C=O C=O 1072

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

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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Concept explainers

Thermochemistry

Thermochemistry can be considered as a branch of thermodynamics that deals with the connections between warmth, work, and various types of energy, formed because of different synthetic and actual cycles. Thermochemistry describes the energy changes that occur as a result of reactions or chemical changes in a substance.

Exergonic Reaction

The term exergonic is derived from the Greek word in which ‘ergon’ means work and exergonic means ‘work outside’. Exergonic reactions releases work energy. Exergonic reactions are different from exothermic reactions, the one that releases only heat energy during the course of the reaction. So, exothermic reaction is one type of exergonic reaction. Exergonic reaction releases work energy in different forms like heat, light or sound. For example, a glow stick releases light making that an exergonic reaction and not an exothermic reaction since no heat is released. Even endothermic reactions at very high temperature are exergonic.

Question

(i)
Determine A,H° for the following reaction using the listed enthalpies of formation:
4CO(g) + 8H2(g)
3CH:(g) + CO2(9) + 2H20(1)
Given:
AH° (kJ)
C(graphite) + ½O2(g)
Co(g)
-110.5
C(graphite) + O2(g)
CO2(g)
-393.5
H2(g) + ½O2(g)
H20(1)
-285.8
C(graphite) + 2H2(g)
CH:(g)
-74.8
(ii)
Using the average bond energies given below calculate A;H° for the target reaction in (i).
Average Bond Energies (kJ mol")
N-H
C-H 413
С-с 348
C=C
436
O-H 463
O=0
391
H-H
N-N 163
418
614
N=N
495
C=C
839
N=N
C=O
941
C=N
C=O
616
C=N
891
799
1072

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