3. Heats of reaction can also be calculated using heats of formation and the relationship-AHrxn = ΣnAHƒ.prod — ΣmAHƒ.reacSubstanceHCl(aq)MgCl2(aq)MgO(s)H₂O(/)H.(kJ/mol)-167.2-796.8-601.2-285.80a.Standard State ElementsCalculate the theoretical AH° values for the following reactionMg(s) + 2HCl(aq) → MgCl2(aq) + H2(g)MgO(s) + 2HCl(aq) → MgCl2(aq) + H2O(l)Mg(s) + O2(g) → MgO(s)

Given the values of the enthalpy of the formation of the compound, we are asked to calculate the…

3. Heats of reaction can also be calculated using heats of formation and the relationship| AHrxn = ΣnAHƒ-prod Substance HCl(aq) MgCl2(aq) MgO(s) - ΣΔΗ. F-reac H₁. (kJ/mol) -167.2 -796.8 -601.2 -285.8 0 a. H₂O(/) Standard State Elements Calculate the theoretical AH° values for the following reaction Mg(s) + 2HCl(aq) → MgCl2(aq) + H2(g) MgO(s) + 2HCl(aq) → MgCl2(aq) + H2O(l) Mg(s) + 202(g) → Mg0(s)

3. Heats of reaction can also be calculated using heats of formation and the relationship| AHrxn = ΣnAHƒ-prod Substance HCl(aq) MgCl2(aq) MgO(s) - ΣΔΗ. F-reac H₁. (kJ/mol) -167.2 -796.8 -601.2 -285.8 0 a. H₂O(/) Standard State Elements Calculate the theoretical AH° values for the following reaction Mg(s) + 2HCl(aq) → MgCl2(aq) + H2(g) MgO(s) + 2HCl(aq) → MgCl2(aq) + H2O(l) Mg(s) + 202(g) → Mg0(s)

Chemistry: The Molecular Science

5th Edition

ISBN:9781285199047

Author:John W. Moore, Conrad L. Stanitski

Publisher:John W. Moore, Conrad L. Stanitski

Chapter4: Energy And Chemical Reactions

Section4.10: Standard Formation Enthalpies

Problem 4.18CE

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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

3. Heats of reaction can also be calculated using heats of formation and the relationship
-
AHrxn = ΣnAHƒ.prod — ΣmAHƒ.reac
Substance
HCl(aq)
MgCl2(aq)
MgO(s)
H₂O(/)
H.(kJ/mol)
-167.2
-796.8
-601.2
-285.8
0
a.
Standard State Elements
Calculate the theoretical AH° values for the following reaction
Mg(s) + 2HCl(aq) → MgCl2(aq) + H2(g)
MgO(s) + 2HCl(aq) → MgCl2(aq) + H2O(l)
Mg(s) + O2(g) → MgO(s)

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