5.3-1 Calculating Enthalpy Change from Bond Energies

Blackline Master 5.3-1

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5.3-1 Calculating Enthalpy Change from Bond Energies

Use the table below to answer the following questions.

Table 1 Average Bond Energies (kJ/mol)

Bond H-H H-F C-H C-O CO C-C C-Cl

Energy 432 565 413 358 1072 347 339

Bond F-F O-H Cl-Cl C=C C=O C=O (for CO2(g)) O=O

Calculate the enthalpy change from bond energies for each of these reactions:

1. H2(g) + F2(g) 2 HF(g)

H =

2. CH4(g) + 2O2(g) CO2(g) + 2H2O (g)

H =

3. CO(g) + 2H2(g) CH3OH(l)

H =

4. 2H2(g) + O2(g) 2H2O(g) 5. 2H2O(g) 2H2(g) + O2(g) 6. H2CCH2(g) + Cl2(g) ClH2CCH2Cl(g)

H = H = H =

7. CH4(g) + H2O(g) CO(g) + 3H2(g)

H =

8. CH3COOH + CH3OH CH3COOCH3 + H2O H =

Energy 154 467 239 614 745 799 495

BLM 5.3-1

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