initial :
aer : 7,5xn moli: (O2 : 1,5x·n ; N2 : 6x·n )
hidrocarbura : n moli
---------------------------------------------------------
n amestec initial = (7,5x+1)n moli
Mi = 1,5x/(7,5x+1) ·32+ 6x/(7,5x+1) ·28 + 14x/(7,5x+1) = 234,5x/(7,5x+1)
CxH2x + 3x/2(O2 + 4N2) ⇒ xCO2 + xH2O + 6xN2
final : n final = nx + nx + 6nx = 8nx
Mf = 44/8 + 18/8 + 6·28/8 = 28,75
234,5x/[28,75(7,5x+1)] = 1,02125 8x = 7,5x +1 x = 2 C2H4