nH2=2,24/22,4=0,1(mol)
nO2=1,68/22,4=0,075 (mol)
PT:
2H2 + O2 \(\underrightarrow{t^0}\) 2H2O
2 .........1...............2 (mol)
0,1 -> 0,05 -> 0,1 (mol)
mH2O=n.M=0,1.18=1,8(g)
Còn chất dư là O2
Số mol O2 dư 0,075-0,05=0,025(mol)
mO2 dư =n.M=0,025.32=0,8(g)
Ta co pthh
2H2 + O2-t0\(\rightarrow\) 2H2O
Theo de bai ta co
nH2=\(\dfrac{2,24}{22,4}=0,1mol\)
nO2=\(\dfrac{1,68}{22,4}=0,075mol\)
Theo pthh
nH2=\(\dfrac{0,1}{2}mol>nO2=\dfrac{0,075}{1}mol\)
\(\Rightarrow\) So mol cua H2 du ( tinh theo so mol cua O2)
Theo pthh
nH2O=2nO2=2.0,075=0,15mol
\(\Rightarrow mH2O=0,15.18=2,7g\)