C3H8 + 5O2 -> 3CO2 + 4H2O + Q
C2H6 + 7/2O2 -> 2CO2 + 3H2O + Q
x+y = 25 |(-3) => -3x-3y=-75
3x+2y = 60 => 3x +2y = 60
/ -y = -15 => y=15 mL
x = 10 mL
%C3H8 = 15/25*100 = 10/25*100 = 40
%C2H6 = 15/25*100 = 60
b) n=V/Vm = 10/22,4 = 0,4464 mmoli C3H8
mC3H8 = 0,4464*44 = 19,642mg
n=V/Vm= 15/22,4 = 0,6696 mmoli C2H6
m C2H6 = 0.6696*30 = 20,08mg
m total = 39,731mg
%C3H8(masic) = 19,642/39,731*100 = 49,43