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We can use Hess’s law to calculate enthalpy changes that cannot be measured. One such reaction is the conversion of methane to ethylene: 2 CH41g2 ¡C2H41g2 + H21g2 Calculate the H for this reaction using the following thermochemical data: CH41g2 + 2 O21g2 ¡CO21g2 + 2 H2O1l2 H = -890.3 kJ C2H41g2 + H21g2 ¡C2H61g2 H = -136.3 kJ 2 H21g2 + O21g2 ¡2 H2O1l2 H = -571.6 kJ 2 C2H61g2 + 7 O21g2¡4 CO21g2 + 6 H2O1l2 H = -3120.8 kJ

We can use Hess’s law to calculate enthalpy changes that cannot be measured. One such reaction is the conversion of methane to ethylene: 2 CH41g2 ¡C2H41g2 + H21g2 Calculate the H for this reaction using the following thermochemical data: CH41g2 + 2 O21g2 ¡CO21g2 + 2 H2O1l2 H = -890.3 kJ C2H41g2 + H21g2 ¡C2H61g2 H = -136.3 kJ 2 H21g2 + O21g2 ¡2 H2O1l2 H = -571.6 kJ 2 C2H61g2 + 7 O21g2¡4 CO21g2 + 6 H2O1l2 H = -3120.8 kJ

General Chemistry - Standalone book (MindTap Course List)
General Chemistry - Standalone book (MindTap Course List)
11th Edition
ISBN:9781305580343
Author:Steven D. Gammon, Ebbing, Darrell Ebbing, Steven D., Darrell; Gammon, Darrell Ebbing; Steven D. Gammon, Darrell D.; Gammon, Ebbing; Steven D. Gammon; Darrell
Publisher:Steven D. Gammon, Ebbing, Darrell Ebbing, Steven D., Darrell; Gammon, Darrell Ebbing; Steven D. Gammon, Darrell D.; Gammon, Ebbing; Steven D. Gammon; Darrell
Chapter6: Thermochemisty
Section: Chapter Questions
Problem 6.132QP
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We can use Hess’s law to calculate enthalpy changes that
cannot be measured. One such reaction is the conversion of
methane to ethylene:
2 CH41g2 ¡C2H41g2 + H21g2
Calculate the H for this reaction using the following thermochemical
data:
CH41g2 + 2 O21g2 ¡CO21g2 + 2 H2O1l2 H = -890.3 kJ
C2H41g2 + H21g2 ¡C2H61g2 H = -136.3 kJ
2 H21g2 + O21g2 ¡2 H2O1l2 H = -571.6 kJ
2 C2H61g2 + 7 O21g2¡4 CO21g2 + 6 H2O1l2 H = -3120.8 kJ

5.110 We can use Hess's law to calculate enthalpy changes that cannot be measured. One such reaction is the conversion of methane to ethylene: 2 CH4(8) C₂H4(8) + H₂(8) Calculate the AH° for this reaction using the following ther- mochemical data: CH4(g) + 2 O₂(8) CO₂(g) + 2 H₂O(1) AH = -890.3 kJ C₂H4(8) + H₂(g) C₂H6(8) AH = -136.3 kJ == 2 H₂(g) + O₂(8) 2 H₂O (1) AH° = -571.6 kJ 2 C₂H6(g) +70₂(g) →→→ 4 CO₂(g) + 6H₂O(1) AH° = -3120.8 kJ
Transcribed Image Text:5.110 We can use Hess's law to calculate enthalpy changes that cannot be measured. One such reaction is the conversion of methane to ethylene: 2 CH4(8) C₂H4(8) + H₂(8) Calculate the AH° for this reaction using the following ther- mochemical data: CH4(g) + 2 O₂(8) CO₂(g) + 2 H₂O(1) AH = -890.3 kJ C₂H4(8) + H₂(g) C₂H6(8) AH = -136.3 kJ == 2 H₂(g) + O₂(8) 2 H₂O (1) AH° = -571.6 kJ 2 C₂H6(g) +70₂(g) →→→ 4 CO₂(g) + 6H₂O(1) AH° = -3120.8 kJ
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