Consider the reactionNaz CO3 (s)→Na2 0(s) + CO2 (g)with enthalpy of reactionΔΗΧWhat is the enthalpy of formation of Na20(s)?321.5kJ/molExpress your answer in kilojoules per mole to one decimal place. Enthalpy H is a measure of the energy content of asystem at constant pressure. Chemical reactionsinvolve changes in enthalpy, AH, which can bemeasured and calculated:-Σροoducts mΔΗ-Σactants ηΔΗwhere the subscript "rxn" is for "enthalpy of reaction"and "f" is for "enthalpy of formation" and m and nrepresent the appropriate stoichiometric coefficients foeach substance.The following table lists some enthalpy of formationvalues for selected substances.SubstanceAH÷° (kJ/mol)CO2 (g)-393.5NaOH(s)-426.7H20(1)-285.8Na2 CO3 (s)-1131.0H2O(g)-241.8

Enthalpy change is the amount of heat evolved or absorbed in a reaction carried out at constant pressure. Find the enthalpy of formation of either reactant or product in the chemical reaction provided the enthalpy change of reaction and enthalpy of formation of other reactants and products are given. The balanced chemical equation is given as, Na2CO3(s)→Na2O(s)+ CO2(g) The enthalpy change to be written as, ∆Hrxn=∑productsm∆Hf∘-∑reactantsm∆Hf∘=∆Hf∘(Na2O)+∆Hf∘(CO2)-∆Hf∘(Na2CO3)321.5KJ/mol=∆Hf∘(Na2O)+(-393.5KJ/mol)-(-1131.0KJ/mol)321.5KJ/mol=∆Hf∘(Na2O)-393.5KJ/mol+1131.0KJ/mol321.5KJ/mol=∆Hf∘(Na2O)+737.5KJ/mol∆Hf∘(Na2O)=-737.5KJ/mol+321.5KJ/mol=-416.0KJ/mol Enthalpy of formation for Na2O(s) is -416.0 kJ/mol.

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Consider the reaction Naz CO3 (s)→Na2O(s) + CO2(g) with enthalpy of reaction AHrxn° = 321.5kJ/mol What is the enthalpy of formation of Na2 0(s)? Express your answer in kilojoules per mole to one decimal place.

Consider the reaction Naz CO3 (s)→Na2O(s) + CO2(g) with enthalpy of reaction AHrxn° = 321.5kJ/mol What is the enthalpy of formation of Na2 0(s)? Express your answer in kilojoules per mole to one decimal place.

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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