Question

Diketahui:
CH3 - C - CH3 + H2 -> CH3 - CH - CH3
|| |
O OH

Tentukan ΔHr jika di ketahui :
C - H : 415. C - O : 360
C - C : 350. O - H : 464
C = O : 745. H - H : 435

Answer 1

Delta pemutusan :
C-H = 6 x 415 = 2490
C-O = 745
H-H = 435
C-C = 2 x 350 = 700
------------------ +
4370

delta pembentukan:
C-C = 7 x 415 = 2905
C-O = 360
O - H = 464
------------------ +
3729

maka,
delta Hr = delta pemutusan - delta pembentukan
delta Hr = 4370 - 3729
delta Hr = 641