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In chemical reactions, heat is converted into chemical energy (the potential energy stored in chemical bonds) or vice versa. Bond energy is the energy required to break one mole of the bond in the gas phase. Since it takes energy to break a bond, bond energies are always positive. Conversely, energy is released when bonds are formed. Thus, the enthalpy change for a reaction can be approximated from Part A Calculate the bond energy per mole for breaking all the bonds in methane, CH4. ΔΗ Σ(ΔΗ breaking) + Σ(ΔΗ forming) Express your answer to four significant figures and include the appropriate units. where H represents bond energies for the breaking (positive bond energy) or forming (negative bond energy) of a bond and Hrxn represents the overall enthalpy for the • View Available Hint(s) reaction. Use the table to answer questions about bond energies. HẢ Bond energy Bond (kJ/mol ) Value Units AHCH, = C-C 347 C=C 611 Submit Сн 414 C-O 360 Part B C=OinCO2 799 O-0 142 Calculate the bond energy per mole for breaking all the bonds of oxygen, O2? 0=0 498 Express your answer to three significant figures and include the appropriate units. но 464 • View Available Hint(s) HA Value Units ΔΗo, - Submit

In chemical reactions, heat is converted into chemical energy (the potential energy stored in chemical bonds) or vice versa. Bond energy is the energy required to break one mole of the bond in the gas phase. Since it takes energy to break a bond, bond energies are always positive. Conversely, energy is released when bonds are formed. Thus, the enthalpy change for a reaction can be approximated from Part A Calculate the bond energy per mole for breaking all the bonds in methane, CH4. ΔΗ Σ(ΔΗ breaking) + Σ(ΔΗ forming) Express your answer to four significant figures and include the appropriate units. where H represents bond energies for the breaking (positive bond energy) or forming (negative bond energy) of a bond and Hrxn represents the overall enthalpy for the • View Available Hint(s) reaction. Use the table to answer questions about bond energies. HẢ Bond energy Bond (kJ/mol ) Value Units AHCH, = C-C 347 C=C 611 Submit Сн 414 C-O 360 Part B C=OinCO2 799 O-0 142 Calculate the bond energy per mole for breaking all the bonds of oxygen, O2? 0=0 498 Express your answer to three significant figures and include the appropriate units. но 464 • View Available Hint(s) HA Value Units ΔΗo, - Submit

Chemistry: The Molecular Science
Chemistry: The Molecular Science
5th Edition
ISBN:9781285199047
Author:John W. Moore, Conrad L. Stanitski
Publisher:John W. Moore, Conrad L. Stanitski
Chapter6: Covalent Bonding
Section: Chapter Questions
Problem 98QRT
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In chemical reactions, heat is converted into chemical energy (the potential energy stored in chemical bonds) or vice versa. Bond energy is the energy required to break one mole of the bond in the gas phase. Since it takes energy to break a bond, bond energies are always positive. Conversely, energy is released when bonds are formed. Thus, the enthalpy change for a reaction can be approximated from Part A Calculate the bond energy per mole for breaking all the bonds in methane, CH4. ΔΗ Σ(ΔΗ breaking) + Σ(ΔΗ forming) Express your answer to four significant figures and include the appropriate units. where H represents bond energies for the breaking (positive bond energy) or forming (negative bond energy) of a bond and Hrxn represents the overall enthalpy for the • View Available Hint(s) reaction. Use the table to answer questions about bond energies. HẢ Bond energy Bond (kJ/mol ) Value Units AHCH, = C-C 347 C=C 611 Submit Сн 414 C-O 360 Part B C=OinCO2 799 O-0 142 Calculate the bond energy per mole for breaking all the bonds of oxygen, O2? 0=0 498 Express your answer to three significant figures and include the appropriate units. но 464 • View Available Hint(s) HA Value Units ΔΗo, - Submit
Transcribed Image Text:In chemical reactions, heat is converted into chemical energy (the potential energy stored in chemical bonds) or vice versa. Bond energy is the energy required to break one mole of the bond in the gas phase. Since it takes energy to break a bond, bond energies are always positive. Conversely, energy is released when bonds are formed. Thus, the enthalpy change for a reaction can be approximated from Part A Calculate the bond energy per mole for breaking all the bonds in methane, CH4. ΔΗ Σ(ΔΗ breaking) + Σ(ΔΗ forming) Express your answer to four significant figures and include the appropriate units. where H represents bond energies for the breaking (positive bond energy) or forming (negative bond energy) of a bond and Hrxn represents the overall enthalpy for the • View Available Hint(s) reaction. Use the table to answer questions about bond energies. HẢ Bond energy Bond (kJ/mol ) Value Units AHCH, = C-C 347 C=C 611 Submit Сн 414 C-O 360 Part B C=OinCO2 799 O-0 142 Calculate the bond energy per mole for breaking all the bonds of oxygen, O2? 0=0 498 Express your answer to three significant figures and include the appropriate units. но 464 • View Available Hint(s) HA Value Units ΔΗo, - Submit
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