For which of the following reactions is ΔH∘rxnΔHrxn∘ equal to ΔH∘fΔHf∘ of the product(s)?You do not need to look up any values to answer this question.     C(s,graphite)+O2(g)→CO2(g)C(s,graphite)+O2(g)→CO2(g) Na(s)+12F2(l)→NaF(s)Na(s)+12F2(l)→NaF(s) CO(g)+12O2(g)→CO2(g)CO(g)+12O2(g)→CO2(g) 2Na(s)+F2(g)→2NaF(s)2Na(s)+F2(g)→2NaF(s) BaCO3(s)→BaO(s)+CO2(g)BaCO3(s)→BaO(s)+CO2(g) Na(s)+12F2(g)→NaF(s)

General Chemistry - Standalone book (MindTap Course List)
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Chapter6: Thermochemisty
Section: Chapter Questions
Problem 6.132QP
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The standard heat of formation, ΔH∘fΔHf∘, is defined as the enthalpy change for the formation of one mole of substance from its constituent elements in their standard states. Thus, elements in their standard states have ΔH∘f=0ΔHf∘=0. Heat of formation values can be used to calculate the enthalpy change of any reaction.

Consider, for example, the reaction

2NO(g)+O2(g)⇌2NO2(g)2NO(g)+O2(g)⇌2NO2(g)

with heat of formation values given by the following table:

Substance ΔH∘fΔHf∘
(kJ/molkJ/mol)
NO(g)NO(g) 90.2
O2(g)O2(g) 0
NO2(g)NO2(g) 33.2

 

Then the standard heat of reaction for the overall reaction is

ΔH∘rxn===ΔH∘f(products)2(33.2)−114 kJ−−ΔH∘f(reactants)[2(90.2)+0]

 

For which of the following reactions is ΔH∘rxnΔHrxn∘ equal to ΔH∘fΔHf∘ of the product(s)?You do not need to look up any values to answer this question.

 

 

C(s,graphite)+O2(g)→CO2(g)C(s,graphite)+O2(g)→CO2(g)
Na(s)+12F2(l)→NaF(s)Na(s)+12F2(l)→NaF(s)
CO(g)+12O2(g)→CO2(g)CO(g)+12O2(g)→CO2(g)
2Na(s)+F2(g)→2NaF(s)2Na(s)+F2(g)→2NaF(s)
BaCO3(s)→BaO(s)+CO2(g)BaCO3(s)→BaO(s)+CO2(g)
Na(s)+12F2(g)→NaF(s)
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