Ch9_Lecture

# Ch9_Lecture - Table 5 Common bond energies(kJ/mol C-H C-F...

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Table 5 Common bond energies (kJ/mol) From online CAMS, D. Wertz C-H 413 N-H 391 O-H 463 H-H 436 C-F 485 N-F 272 O-F 190 H-F 565 F-F 159 C-Cl 328 N-Cl 200 O-Cl 203 H-Cl 431 Cl-Cl 243 C-Br 276 N-Br 243 O-Br 235 H-Br 366 Br-Br 193 C-I 234 O-I 234 H-I 299 I-I 151 C-C 347 N-N 163 C-N 293 C-O 358 O-O 146 C=C 612 N=N 418 C=N 615 C=O 799 O=O 495 C C 820 N N 941 C N 891 C O 1072

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E S L G If evaporation costs heat energy (enthalpy) and freezing releases heat energy (enthalpy) then why does the process that COSTS energy occur spontaneously at room temperature? S L G H Section 9.5 exothermic endothermic If only enthalpy determined if a process was spontaneous,   A GLASS OF WATER AT ROOM TEMPERATURE WOULD TURN TO ICE What else contributes to spontaneity? 2
S univ = S system + S sur > 0 S = Entropy (S) units J/K S univ  > 0 for all spontaneous processes meaning whenever something spontaneous happens, the universe gets more messy. q heat (J) T temperature (K) Section 9.5 3

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Solids versus Gases?
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