MISSED THIS? Watch KCV: Determining the Enthalpy of Reaction from Standard Enthalpies of Formation, IWE: AH*rxn and the Standard Enthalpies of Formation: Read Section 7.9. You can click on the Review link to access the section in your e Text. Hydrazine (N₂H₁) is a fuel used by some spacecraft. It is normally oxidized by N₂O, according to the following equation: N₂H₁ (1) + N₂O₂(g) → 2N₂O(g) + 2H₂O(g) The table below shows standard enthalpies of formation for a number of substances. Substance AH; (kJ/mol) N₂(g) NH:(g) N₂H₁ (1) N₂H.(g) N₂O(g) NO(g) N₂O₁ (g) H₂O₂ (1) H₂O₂(g) H₂O(g) H₂O(1) 0.0 -45.9 50.6 95.4 81.6 91.3 9.16 -187.8 -136.3 -241.8 -285.8 Part A Calculate AHin for this reaction using standard enthalpies of formation from the table to the left. Express your answer in kilojoules to one decimal place. IVD ΑΣΦ AH = an Provide Feedback www. kJ
MISSED THIS? Watch KCV: Determining the Enthalpy of Reaction from Standard Enthalpies of Formation, IWE: AH*rxn and the Standard Enthalpies of Formation: Read Section 7.9. You can click on the Review link to access the section in your e Text. Hydrazine (N₂H₁) is a fuel used by some spacecraft. It is normally oxidized by N₂O, according to the following equation: N₂H₁ (1) + N₂O₂(g) → 2N₂O(g) + 2H₂O(g) The table below shows standard enthalpies of formation for a number of substances. Substance AH; (kJ/mol) N₂(g) NH:(g) N₂H₁ (1) N₂H.(g) N₂O(g) NO(g) N₂O₁ (g) H₂O₂ (1) H₂O₂(g) H₂O(g) H₂O(1) 0.0 -45.9 50.6 95.4 81.6 91.3 9.16 -187.8 -136.3 -241.8 -285.8 Part A Calculate AHin for this reaction using standard enthalpies of formation from the table to the left. Express your answer in kilojoules to one decimal place. IVD ΑΣΦ AH = an Provide Feedback www. kJ
Chemistry: An Atoms First Approach
2nd Edition
ISBN:9781305079243
Author:Steven S. Zumdahl, Susan A. Zumdahl
Publisher:Steven S. Zumdahl, Susan A. Zumdahl
Chapter7: Chemical Energy
Section: Chapter Questions
Problem 113AE: Compare your answer from Exercise 72 of Chapter 3 to the H value calculated from standard enthalpies...
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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
Transcribed Image Text:MISSED THIS? Watch KCV: Determining the Enthalpy of Reaction from Standard
Enthalpies of Formation, IWE: AH°rxn and the Standard Enthalpies of
Formation: Read Section 7.9. You can click on the Review link to access the section in
your e Text.
Hydrazine (N₂H₂) is a fuel used by some spacecraft. It is normally oxidized by
N₂O, according to the following equation:
N₂H₁ (1) + N₂O₂(g) → 2N₂O(g) + 2H₂O(g)
The table below shows standard enthalpies of formation for a number of substances.
Substance AH; (kJ/mol)
N₂(g)
NH:(g)
N₂H₁ (1)
N₂H₁(B)
N₂O(g)
NO(g)
N₂O₁ (g)
H₂O₂(1)
H₂O₂(g)
H₂O(g)
H₂O(1)
0.0
-45.9
50.6
95.4
81.6
91.3
9.16
-187.8
-136.3
-241.8
-285.8
Part A
Calculate AHin for this reaction using standard enthalpies of formation from the table to the left.
Express your answer in kilojoules to one decimal place.
IVD ΑΣΦ
AH=
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