Question

Ch 9 Q 39

Which is expected to have the largest carbom-oxygen bond dissociation energy?

-HCOOH

-H2CO3

-CO2

-CO

9.106

Use the bond dissociation energies from the table provided to calculate an approximate standard enthalpy in kilojoules for the reaction of ethylene with hydrogen to yield ethane

Problem 9.106 Average Bond Dissociation Energies, D /mol) H-H 136 C-H410N - 390 0 F 1801-11 H-C 410 C-C 350 N-C 300 0-d 200 S-F 310 H-F 570 C-F 450 N-F 270 o-Br210 s-d 250 + Hd 432 c-d 330 N-d 200 0-1 220 S-Br 210 H-Br 366 C-Br270 N-Br 240 ON 200 S-$ 225 H-1 298 C-1 240 N-N 240 0-0 180 H-N 390 C-N 300 N-O 200 F-F 159 - 460 C-o 350 0-H 460 d-a 243 H S 340 C- 260 0-C 350 Br-Br 193 Multiple covalent bonds C-C738 CCS CO7320 498 NN945 Part A Use the bond dissociation energies from the table above to calculate an approximate AH in kilojoules for the reaction of ethylene with hydrogen to yield ethane HẠC CHỊ(g) + H (9) + CH3CH(g) Express your answer as an integer and include the appropriate units

Answer 1

HH H 8. 39. In - co the band order is 3 and in other compounds it is less than 3. Hence, - co would have largest carlion -oxygen bond dissociation energy . 2.106. The reaction is nyc = Ch 11 (9) +H-H(g) 7H-4-4-n 18) using the standard value 44° = 6014-H) + DLC-C) - ) CH-H) - D (C=C) -A) (C-H) = 2D(C-H) + 1) (C-C) - DCH-H) - D(C=C) - 2x A10 + 350-436-728 kJ 26KI