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**Chemistry: Calculating Heat of Reactions with Bond Energies** This title encompasses the content of the text language,

Learn to calculate heat of reactions using bond energies in chemistry, including examples like C2H4(g) + O3(g) -> CH3CHO(g) + O2(g) and C3H7OH(l) + O2(g) -> CO2(g) + H2O(g).

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**Chemistry: Calculating Heat of Reactions with Bond Energies** This title encompasses the content of the text language,

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  1. DHr = S Bonds Broken - S Bonds Made C2H4(g) + O3(g) → CH3CHO(g) + O2(g)

  2. DHr = -332 kJ DHr = S Bonds Broken - S Bonds Made C2H4(g) + O3(g) → CH3CHO(g) + O2(g) 3239 kJ 2907 kJ 1 mol O=O @ 495 kJ/mol 1 mol O=O @ 495 kJ/mol 1 mol O-O @ 146 kJ/mol 1 mol C=C @ 614 kJ/mol 1 mol C-C @ 347 kJ/mol 4 mol C-H @ 413 kJ/mol 4 mol C-H @ 413 kJ/mol 1 mol C=O @ 745 kJ/mol

  3. DHr = [1 mol (-166 kJ/mol)] – [1 mol (52kJ/mol) + 1 mol (143 kJ/mol)] DHr = S nDHf°prod - S nDHf°react DHr = -361 kJ C2H4(g) + O3(g) → CH3CHO(g) + O2(g) 52 143 -166 0 Heats of formation in kJ per mole

  4. C3H7OH(l) + O2(g) → CO2(g) + H2O(g) 4.5 3 4 Estimate the heat of combustion for isopropyl alcohol using bond energies. 8 mol O-H @ 467 kJ/mol 4.5 mol O=O @ 495 kJ/mol 6 mol C=O @ 799 kJ/mol 7 mol C-H @ 413 kJ/mol 1 mol C-O @ 358 kJ/mol DHr = 6638 kJ – 8530 kJ = 1 mol O-H @ 467 kJ/mol DHr = -1892 kJ 2 mol C-C @ 347 kJ/mol

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