Calculate the enthalpy of the reaction 2NO(g)+O2(g)→2NO2(g) given the following reactions and enthalpies of formation: 12N2(g)+O2(g)→NO2(g),   ΔH∘A=33.2 kJ 12N2(g)+12O2(g)→NO(g),  ΔH∘B=90.2 kJ Calculate the enthalpy of the reaction 4B(s)+3O2(g)→2B2O3(s) given the following pertinent information: B2O3(s)+3H2O(g)→3O2(g)+B2H6(g),    ΔH∘A=+2035 kJ 2B(s)+3H2(g)→B2H6(g),                             ΔH∘B=+36 kJ H2(g)+12O2(g)→H2O(l),                             ΔH∘C=−285 kJ H2O(l)→H2O(g),                                           ΔH∘D=+44 kJ

Chemistry: Matter and Change
1st Edition
ISBN:9780078746376
Author:Dinah Zike, Laurel Dingrando, Nicholas Hainen, Cheryl Wistrom
Publisher:Dinah Zike, Laurel Dingrando, Nicholas Hainen, Cheryl Wistrom
Chapter15: Energy And Chemical Change
Section: Chapter Questions
Problem 92A
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Calculate the enthalpy of the reaction

2NO(g)+O2(g)→2NO2(g)

given the following reactions and enthalpies of formation:

  1. 12N2(g)+O2(g)→NO2(g),   ΔH∘A=33.2 kJ
  2. 12N2(g)+12O2(g)→NO(g),  ΔH∘B=90.2 kJ

Calculate the enthalpy of the reaction

4B(s)+3O2(g)→2B2O3(s)

given the following pertinent information:

  1. B2O3(s)+3H2O(g)→3O2(g)+B2H6(g),    ΔH∘A=+2035 kJ
  2. 2B(s)+3H2(g)→B2H6(g),                             ΔH∘B=+36 kJ
  3. H2(g)+12O2(g)→H2O(l),                             ΔH∘C=−285 kJ
  4. H2O(l)→H2O(g),                                           ΔH∘D=+44 kJ
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Calculate the enthalpy of the reaction

4B(s)+3O2(g)→2B2O3(s)4B(s)+3O2(g)→2B2O3(s)

given the following pertinent information:

  1. B2O3(s)+3H2O(g)→3O2(g)+B2H6(g),    ΔH∘A=+2035 kJB2O3(s)+3H2O(g)→3O2(g)+B2H6(g),    ΔHA∘=+2035 kJ
  2. 2B(s)+3H2(g)→B2H6(g),                             ΔH∘B=+36 kJ2B(s)+3H2(g)→B2H6(g),                             ΔHB∘=+36 kJ
  3. H2(g)+12O2(g)→H2O(l),                             ΔH∘C=−285 kJH2(g)+12O2(g)→H2O(l),                             ΔHC∘=−285 kJ
  4. H2O(l)→H2O(g),                                           ΔH∘D=+44 kJ
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