Part A Chemical energy is released or absorbed from reactions in various forms. The most easily measurable form of energy comes in the form of heat, or enthalpy. The enthalpy of a reaction can be calculated from the standard heats of formation of the substances involved in the reaction: Calculate the standard enthalpy change for the reaction Δ. ΗΣn, Δι Η (products )-Σn, Δ Η (reactants) 2A +B 20 + 2D where the heats of formation are given in the following table: Here, np represents the stoichiometric coefficients of the products, of the reactants. represents the stoichiometric coeffi cients A H (kJ mol-) Substance The standard entropy change for the reaction, A,S°, is a measure of the change in how the energy can be spread out during the course of the reaction. The standard Gibbs energy change for the reaction can be estimated at any temperature using A -243 -421 A,G = A,H° - TA,S C 193 assuming A, H° and A,S° do not change with temperature. D -487 Express your answer in kJ mol A,H° - kJ mol Submit Request Answer
Part A Chemical energy is released or absorbed from reactions in various forms. The most easily measurable form of energy comes in the form of heat, or enthalpy. The enthalpy of a reaction can be calculated from the standard heats of formation of the substances involved in the reaction: Calculate the standard enthalpy change for the reaction Δ. ΗΣn, Δι Η (products )-Σn, Δ Η (reactants) 2A +B 20 + 2D where the heats of formation are given in the following table: Here, np represents the stoichiometric coefficients of the products, of the reactants. represents the stoichiometric coeffi cients A H (kJ mol-) Substance The standard entropy change for the reaction, A,S°, is a measure of the change in how the energy can be spread out during the course of the reaction. The standard Gibbs energy change for the reaction can be estimated at any temperature using A -243 -421 A,G = A,H° - TA,S C 193 assuming A, H° and A,S° do not change with temperature. D -487 Express your answer in kJ mol A,H° - kJ mol Submit Request Answer
Chemistry & Chemical Reactivity
10th Edition
ISBN:9781337399074
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 81GQ: The standard molar enthalpy of formation of diborane, B2H6(g), cannot be determined directly because...
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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.
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Transcribed Image Text:Part A
Chemical energy is released or absorbed from reactions in various forms. The most easily measurable form of
energy comes in the form of heat, or enthalpy. The enthalpy of a reaction can be calculated from the standard
heats of formation of the substances involved in the reaction:
Calculate the standard enthalpy change for the reaction
Δ.ΗΣη, Δι Η' (products) -Σn, Δι Η' (reactants)
2A +B= 2C + 2D
where the heats of formation are given in the following table:
Here, np represents the stoichiometric coefficients of the products, n; represents the stoichiometric coeffi cients
Af H°
| (kJ mol¬1)
of the reactants.
Substance
The standard entropy change for the reaction, A,S°, is a measure of the change in how the energy can be
spread out during the course of the reaction. The standard Gibbs energy change for the reaction can be
estimated at any temperature using
A
-243
В
-421
Δ,G Δ, Η-ΤΔ, S9
C
193
assuming A, H° and A, Sº do not change with temperature.
-487
Express your answer in kJ mol¬1.
V AZ
?
A,H° =
kJ mol-1
Submit
Request Answer
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