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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 Express your answer to three significant figures and include the appropriate units. • View Available Hint(s) HẢ ? ΔΗ Σ(ΔΗ breaking) + Σ(ΔΗ forming) Value 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 AHo, = reaction. Submit Use the table to answer questions about bond energies. Bond energy Bond (kJ/mol ) Part C C-C 347 Calculate the bond energy per mole for forming all the bonds of water molecules, H2O. C=C 611 СН Express your answer to three significant figures and include the appropriate units. 414 C-O • View Available Hint(s) 360 C=OinCO2 799 0-O HẢ 142 0=0 498 Value Units ΔΗΗ,0- 464 Submit Part D Calculate the bond energy per mole for forming all the bonds of carbon dioxide, CO2. Express your answer to four significant figures and include the appropriate units. • View Available Hint(s) HẢ Value Units ДНсо, - 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 Express your answer to three significant figures and include the appropriate units. • View Available Hint(s) HẢ ? ΔΗ Σ(ΔΗ breaking) + Σ(ΔΗ forming) Value 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 AHo, = reaction. Submit Use the table to answer questions about bond energies. Bond energy Bond (kJ/mol ) Part C C-C 347 Calculate the bond energy per mole for forming all the bonds of water molecules, H2O. C=C 611 СН Express your answer to three significant figures and include the appropriate units. 414 C-O • View Available Hint(s) 360 C=OinCO2 799 0-O HẢ 142 0=0 498 Value Units ΔΗΗ,0- 464 Submit Part D Calculate the bond energy per mole for forming all the bonds of carbon dioxide, CO2. Express your answer to four significant figures and include the appropriate units. • View Available Hint(s) HẢ Value Units ДНсо, - Submit

Chemistry: Principles and Reactions
Chemistry: Principles and Reactions
8th Edition
ISBN:9781305079373
Author:William L. Masterton, Cecile N. Hurley
Publisher:William L. Masterton, Cecile N. Hurley
Chapter8: Thermochemistry
Section: Chapter Questions
Problem 79QAP: Which statement(s) is/are true about bond enthalpy? (a) The bond energy for a triple bond between A...
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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 Express your answer to three significant figures and include the appropriate units. • View Available Hint(s) HẢ ? ΔΗ Σ(ΔΗ breaking) + Σ(ΔΗ forming) Value 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 AHo, = reaction. Submit Use the table to answer questions about bond energies. Bond energy Bond (kJ/mol ) Part C C-C 347 Calculate the bond energy per mole for forming all the bonds of water molecules, H2O. C=C 611 СН Express your answer to three significant figures and include the appropriate units. 414 C-O • View Available Hint(s) 360 C=OinCO2 799 0-O HẢ 142 0=0 498 Value Units ΔΗΗ,0- 464 Submit Part D Calculate the bond energy per mole for forming all the bonds of carbon dioxide, CO2. Express your answer to four significant figures and include the appropriate units. • View Available Hint(s) HẢ Value Units ДНсо, - 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 Express your answer to three significant figures and include the appropriate units. • View Available Hint(s) HẢ ? ΔΗ Σ(ΔΗ breaking) + Σ(ΔΗ forming) Value 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 AHo, = reaction. Submit Use the table to answer questions about bond energies. Bond energy Bond (kJ/mol ) Part C C-C 347 Calculate the bond energy per mole for forming all the bonds of water molecules, H2O. C=C 611 СН Express your answer to three significant figures and include the appropriate units. 414 C-O • View Available Hint(s) 360 C=OinCO2 799 0-O HẢ 142 0=0 498 Value Units ΔΗΗ,0- 464 Submit Part D Calculate the bond energy per mole for forming all the bonds of carbon dioxide, CO2. Express your answer to four significant figures and include the appropriate units. • View Available Hint(s) HẢ Value Units ДНсо, - Submit
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