Chemical energy is released or absorbed from reactions in various forms. The most easilymeasurable form of energy comes in the form of heat, or enthalpy. The enthalpy of a reaction canbe calculated from the standard heats of formation of the substances involved in the reaction:• Part AA,H° =E,A; H° (products) – ET,A,H° (reactants)Calculate the standard enthalpy change for the reaction2A +B 20+ 2DHere, , represents the stoichiometric coefficients of the products, n, represents thestoichiometric coeffi cients of the reactants.where the heats of formation are given in the following table:Ar H°(kJ mol)SubstanceThe standard entropy change for the reaction, A,S", is a measure of the change in how theenergy can be spread out during the course of the reaction. The standard Gibbs energy changefor the reaction can be estimated at any temperature usingA-265B-421A,G = A,H° -TA,S225assuming ArH° and A,S° do not change with temperature.D-483Express your answer in k.J mol> View Available Hint(s)A,H°- 435 k.J mol-SubmitPrevloun Answerev Correct• Part BFor the reaction given in Part A, how much heat is absorbed when 3.00 mol of A reacts?Express your answer numerically in kilojoules.> View Available Hint(s)Templates Symbole undo regio teset keyboard shortcuts HelpkJSubmit

Given: 2A+B↔2C+2D Substance ∆Hfo(kJ/mol) A -265 B -421 C 225 D -483

Answered: Calculate the standard enthalpy change…

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Calculate the standard enthalpy change for the reaction where the heats of formation are given in the following table

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

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:
• Part A
A,H° =E,A; H° (products) – ET,A,H° (reactants)
Calculate the standard enthalpy change for the reaction
2A +B 20+ 2D
Here, , represents the stoichiometric coefficients of the products, n, represents the
stoichiometric coeffi cients of the reactants.
where the heats of formation are given in the following table:
Ar 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
-265
B
-421
A,G = A,H° -TA,S
225
assuming ArH° and A,S° do not change with temperature.
D
-483
Express your answer in k.J mol
> View Available Hint(s)
A,H°- 435 k.J mol-
Submit
Prevloun Answere
v Correct
• Part B
For the reaction given in Part A, how much heat is absorbed when 3.00 mol of A reacts?
Express your answer numerically in kilojoules.
> View Available Hint(s)
Templates Symbole undo regio teset keyboard shortcuts Help
kJ
Submit

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