:
C2H4() + 3O2() = 2CO2() + 2H2O().
.
(S) . - , , . . . , . , , . .
, , (e, ) . , , , .
, S0. [1-4].
, , , . . :
DS0.. = n S0. - n S0. .
DS0 . [1] :
C2H4 () O2 () CO2 () H2O(),
S0, /× 219,45 205,03 213,65 188,72,
DS0.. = [2S0(H2O) + 2S0(CO2)] - [S0(C2H4) + 3S0(O2)] =
= (2 × 188,72 + 2 × 213,65) - (219,45 + 3 × 205,03) = -29,80 ×K.