Example: Using the table of average bond energies below, the for the reaction is _________ kJ. (answer: -217 ΔH kJ/mol) Bond: C≡C C–C H–I C–I C–H (kJ/mol): 839 348 299 240 413 Δ = [1(839) + 2(299)] [4(413) + 2(240)] = -695kJ ∆H0rxn – Using the table of bond dissociation energies, the for the following gas-phase reaction is ______ kJ. ΔH (ans.=-44kj/mol) reaction below is used to produce methanol. Calculate the C-H bond energy given the following The data: (ans.= 417 kJ/mol) C≡O (g) + 2 H-H (g) CH3OH (l) = -128 kJ → ΔHrxn
Example: Using the table of average bond energies below, the ΔH for the reaction is _________ kJ. (answer: -217 kJ/mol) Bond: C≡C C–C H–I C–I C–H Δ (kJ/mol): 839 348 299 240 413 ∆H0rxn = [1(839) + 2(299)] – [4(413) + 2(240)] = -695kJ Using the table of bond dissociation energies, the ΔH for the following gas-phase reaction is ______ kJ. (ans.=-44kj/mol) The reaction below is used to produce methanol. Calculate the C-H bond energy given the following data: (ans.= 417 kJ/mol) C≡O (g) + 2 H-H (g) → CH3OH (l) ΔHrxn = -128 kJ
Thermo_notes_2015-2016.docx