Question

need help with both parts, i got them wrong, please show work, thanks

Table 5.1 Experimental Bond Dissociation Enthalpies Y-Z → Y + Z Bond DH Bond DH (kcaVmol (kJ/mol) (kcal/mol) (kJ/mol) 105.0 101.1 439 104.2 37.7 58.0 53.5 51.0 136.3 103.2 87.5 71.3 CH3-H 436 158 243 CH,CH-H 423 CI-CI 413 (CH)2CH-H (CH3) 3C-H 98.6 96.5 Br-Br CH3-CH3 CH CH2-CH, (CH)2CH CH (CH) C CH, 90.2 89.1 88.6 87.5 377 373 371 214 570 432 366 298 H-CI H-Br CH,--F CH,-CI 114.8 83.6 84.7 70.7 57.1 480 H,C= CH, HC CH 174.5 230.4 730 350 964 296 CH3)C-Br CH3-1 CH,CH2-I (CH,) CH-a 85.1 CH3)3C-C CH,-Br CH,CH2-Br (CH)2CH- 72.0 110.7 133.3 463 558 235 356 355 294 HO-H CHO-H CH3-OH 118.8 104.2 92.1 497 436 386 84.8 70.3 70.5 301