Ta co pthh
X+2O2\(\rightarrow\)CO2+2H2O
Vi khi ket thuc phan ung thu duoc CO2 va H2O nen chac chan trong cong thuc hoa hoc cua X se co C va H
Goi Cthh tong quat cua C va H la CxHy
theo de bai ta co nO2= \(\dfrac{10,08}{22,4}=0,45mol\)
ta co pthh 1 C + O2 \(\rightarrow\)CO2
pthh 2 2H2+O2\(\rightarrow\)2H2O
theo de bai ta co
nCO2= \(\dfrac{13,2}{44}=0,3mol\)
nH2O=\(\dfrac{7,2}{18}=0,4mol\)
Theo pthh1 ta co nO2=\(\dfrac{0,45}{1}mol>nCO2=\dfrac{0,3}{1}mol\)
\(\Rightarrow\)O2 du tinh theo so mol cua CO2
thoe pthh 1 ta co nC=nCO2= 0,3 mol
theo pthh 2 ta co nO2=\(\dfrac{0,45}{1}mol>nH2O=\dfrac{0,4}{2}mol\)
\(\Rightarrow\)O2 du tinh theo so mol cua H2O
theo pthh nH2 = nH2O=0,4 mol
minh chi biet lam nhu the thoi ko biet dung hay sai nua nhung chac cthh la CH4