M(CxHy)=15*2=30
N(C)=30*80/100*12=2
N(H)=30*20/100*1=6
C2H6
2C2H6+7O2=4CO2+6H2O
nC2H6:nO2=2:7
n(O2)=7*0,3/2=1,05моль
V(O2)=1.05*22,4=23,52л
M(CxHy)=15*2=30
N(C)=30*80/100*12=2
N(H)=30*20/100*1=6
C2H6
2C2H6+7O2=4CO2+6H2O
nC2H6:nO2=2:7
n(O2)=7*0,3/2=1,05моль
V(O2)=1.05*22,4=23,52л