Enthalpy H is a measure of the energy content of a system at constant pressure. Chemical reactions involve changes in enthalpy, AH, which can be measured and calculated AHr-products MAH-actants AH where the subscript "rxn" is for "enthalpy of reaction" and "P" is for "enthalpy of formation" and m and n represent the appropriate stoichiometric coefficients for each substance The following table lists some enthalpy of formation values for selected substances. AH (kJ/mol) Part A Determine the enthalpy for this reaction: 2NaOH(s) + CO2(g)-NazCOs (s) + H2O(l) Express your answer in kilojoules per mole to one decimal place. ΜΕ ΑΣΦ ΑΣΦ 20 ? AH Submit Request Answer kJ/mol Substance CO2(g) -393.5 ▾ Part B NaOH(s) -426.7 H₂O(1) -285.8 Consider the reaction Na2CO3(s) -1131.0 H₂O(g) -241.8 with enthalpy of reaction What is the enthalpy of formation of Na2O(s)? Na2CO3(s) Na2O(s) + CO2(g) AH 321.5kJ/mol Express your answer in kilojoules per mole to one decimal place. ΜΕ ΑΣΦ ΔΗ, = Submit Request Answer ? kJ/mol
Enthalpy H is a measure of the energy content of a system at constant pressure. Chemical reactions involve changes in enthalpy, AH, which can be measured and calculated AHr-products MAH-actants AH where the subscript "rxn" is for "enthalpy of reaction" and "P" is for "enthalpy of formation" and m and n represent the appropriate stoichiometric coefficients for each substance The following table lists some enthalpy of formation values for selected substances. AH (kJ/mol) Part A Determine the enthalpy for this reaction: 2NaOH(s) + CO2(g)-NazCOs (s) + H2O(l) Express your answer in kilojoules per mole to one decimal place. ΜΕ ΑΣΦ ΑΣΦ 20 ? AH Submit Request Answer kJ/mol Substance CO2(g) -393.5 ▾ Part B NaOH(s) -426.7 H₂O(1) -285.8 Consider the reaction Na2CO3(s) -1131.0 H₂O(g) -241.8 with enthalpy of reaction What is the enthalpy of formation of Na2O(s)? Na2CO3(s) Na2O(s) + CO2(g) AH 321.5kJ/mol Express your answer in kilojoules per mole to one decimal place. ΜΕ ΑΣΦ ΔΗ, = Submit Request Answer ? kJ/mol
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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Transcribed Image Text:Enthalpy H is a measure of the energy content of a
system at constant pressure. Chemical reactions
involve changes in enthalpy, AH, which can be
measured and calculated
AHr-products MAH-actants AH
where the subscript "rxn" is for "enthalpy of reaction"
and "P" is for "enthalpy of formation" and m and n
represent the appropriate stoichiometric coefficients for
each substance
The following table lists some enthalpy of formation
values for selected substances.
AH (kJ/mol)
Part A
Determine the enthalpy for this reaction:
2NaOH(s) + CO2(g)-NazCOs (s) + H2O(l)
Express your answer in kilojoules per mole to one decimal place.
ΜΕ ΑΣΦ
ΑΣΦ
20
?
AH
Submit
Request Answer
kJ/mol
Substance
CO2(g)
-393.5
▾ Part B
NaOH(s)
-426.7
H₂O(1)
-285.8
Consider the reaction
Na2CO3(s)
-1131.0
H₂O(g)
-241.8
with enthalpy of reaction
What is the enthalpy of formation of Na2O(s)?
Na2CO3(s) Na2O(s) + CO2(g)
AH 321.5kJ/mol
Express your answer in kilojoules per mole to one decimal place.
ΜΕ ΑΣΦ
ΔΗ, =
Submit
Request Answer
?
kJ/mol
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