Calculate the enthalpy of the reaction below (DHrxn, in kJ) using the bond energies provided. 2H2 (g) + O2 (g) --> 2H2O (g) SingleBondH|cN|oH432C411346N386 305167459358201142C=C602C=O799C=C835C=O1072MultipleBondsC=N615O=0494C=N887N=N942**All values in kJ/mol**

Bond dissociation energy of H-H bond = 432 kJ / mol H-O bond = 459 kJ/mol O=O bond = 494 kJ/mol…

Answered: Calculate the enthalpy of the reaction…

Calculate the enthalpy of the reaction below (DHrxn, in kJ) using the bond energies provided. 2H2 (g) + O2 (g) --> 2H2O (g)

Chemistry: The Molecular Science

5th Edition

ISBN:9781285199047

Author:John W. Moore, Conrad L. Stanitski

Publisher:John W. Moore, Conrad L. Stanitski

Chapter5: Electron Configurations And The Periodic Table

Section: Chapter Questions

Problem 3QRT

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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

Calculate the enthalpy of the reaction below (DHrxn, in kJ) using the bond energies provided.

2H₂ (g) + O₂ (g) --> 2H₂O (g)

Single
Bond
H|c
N|o
H
432
C
411
346
N
386 305
167
459
358
201
142
C=C
602
C=O
799
C=C
835
C=O
1072
Multiple
Bonds
C=N
615
O=0
494
C=N
887
N=N
942
**All values in kJ/mol**

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