Trong cung dk nhiet do, ap suat thi ti le ve the tich cung la ti le so mol.
VO2(trc pu)=5 l
VO2(sau pu)=3+4/2=5 l
=>ko co O trong A.
Goi ctpt cua A la CxHy:
CxHy+(x+y/4)O2>xCO2+y/2H2O
1.............5......................3...
=>x=3.1/1=3
y/2=4.1/1=4
=>y=8
vay A la C3H8