Homework:

Page 512

problems 31, 34, 35

31. a.

CaCO3 → CaO + CO2

31. a.

CaCO3 → CaO + CO2

∆Hf(reaction) = 178.3 kJ

31. b.

CH4 + 2Cl2 → CCl4 + 2H2

31. b.

CH4 + 2Cl2 → CCl4 + 2H2

∆Hf(reaction) = -53.4 kJ

31. c.

N2 + 2O2 → 2NO2

31. c.

N2 + 2O2 → 2NO2

∆Hf(reaction) = 66.36 kJ

31. d.

2H2O2 → 2H2O + O2

31. d.

2H2O2 → 2H2O + O2

∆Hf(reaction) = -196.1 kJ

31. e. 4NH3 + 7O2 → 4NO2 + 6H2O

31. e. 4NH3 + 7O2 → 4NO2 + 6H2O

∆Hf(reaction) = -1397.82 kJ

34.On the scale of standard

enthalpies of formations, how are the elements in their standard states defined?

35.Low energy is associated with

stability. Examine the data in table 16-7. what conclusion can you draw about the stabilities of the compounds listed relative to the elements in their standard states? .