We can use Hess's Law (and some creativity!) to learn about the energetics of reactions that occur in remote environments. Consider the atmospheric reaction, NO + O → NO₂ (a) Use the dissociation energy of O2, 498.34 kJ/mol, and the standard heats of formation for NO (+90.25 kJ/mol) and NO₂ (+33.18 kJ/mol) to derive the enthalpy change for this reaction. QUESTION 14 (b) The two bonds in NO2 are equivalent, and we can use the bond strength of N₂, 945 kJ/mol, and the information given in part (a) to determine ArxnH for N+O+O→ NO₂ From this ArxnH, estimate the bond strength of each of the resulting N-O bonds in kJ/mol. (Note: Your answer for this part does not necessarily depend on your answer to part a).
We can use Hess's Law (and some creativity!) to learn about the energetics of reactions that occur in remote environments. Consider the atmospheric reaction, NO + O → NO₂ (a) Use the dissociation energy of O2, 498.34 kJ/mol, and the standard heats of formation for NO (+90.25 kJ/mol) and NO₂ (+33.18 kJ/mol) to derive the enthalpy change for this reaction. QUESTION 14 (b) The two bonds in NO2 are equivalent, and we can use the bond strength of N₂, 945 kJ/mol, and the information given in part (a) to determine ArxnH for N+O+O→ NO₂ From this ArxnH, estimate the bond strength of each of the resulting N-O bonds in kJ/mol. (Note: Your answer for this part does not necessarily depend on your answer to part a).
Chemistry & Chemical Reactivity
9th Edition
ISBN:9781133949640
Author:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Publisher:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Chapter5: Principles Of Chemical Reactivity: Energy And Chemical Reactions
Section: Chapter Questions
Problem 61PS: The standard enthalpy of formation of solid barium oxide, BaO, is 553.5 kJ/mol, and the standard...
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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
Transcribed Image Text:We can use Hess's Law (and some creativity!) to learn about the energetics of reactions that occur in remote environments. Consider the
atmospheric reaction,
NO + O → NO₂
(a) Use the dissociation energy of O2, 498.34 kJ/mol, and the standard heats of formation for NO (+90.25 kJ/mol) and NO₂ (+33.18 kJ/mol)
to derive the enthalpy change for this reaction.
QUESTION 14
(b) The two bonds in NO2 are equivalent, and we can use the bond strength of N₂, 945 kJ/mol, and the information given in part (a) to
determine ArxnH for
N+O+O→ NO₂
From this ArxnH, estimate the bond strength of each of the resulting N-O bonds in kJ/mol. (Note: Your answer for this part does not
necessarily depend on your answer to part a).
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