2H2+O2--->2H2O
a)n\(_{H2}=0,4\left(mol\right)\)
n\(_{O2}=0,3\left(mol\right)\)
=> O2 dư(do tỉ số)
Theo pthh
n\(_{H2O}=n_{H2}=0,4\left(mol\right)\)
m\(_{H2O}=0,4.18=7,2\left(g\right)\)
Bài 2
M+2H20--->M(OH)2+H2
n\(_{H2}=\frac{3,36}{22,4}=0,15\left(mol\right)\)
n\(_M=n_{H2}=0,15\left(mol\right)\)
M\(_M=\frac{12}{0,15}=80\)
Xem lại đề
\(n_{H2}=0,4\left(mol\right)\)
\(n_{O2}=0,3\left(mol\right)\)
\(PTHH:O_2+H_2O\rightarrow2H_2O\)
Vì \(0,3< 0,4\Rightarrow O2\)dư
\(\Rightarrow nH_2O=n_{H2}=0,4\left(mol\right)\)
\(\Rightarrow m_{H2O}=7,2\left(g\right)\)
1)
nH2 = 0.4 mol
nO2 = 0.3 mol
2H2 + O2 -to-> 2H2O
Bđ: 0.4___0.3
Pư: 0.4____0.2_____0.4
Kt: 0______0.1_____0.4
mH2O = 0.4*18=7.2 g
2)
nH2 = 3.36/22.4=0.15 mol
M + 2H2O --> M(OH)2 + H2
0.15__________________0.15
MM = 12/0.15 = 80 => Đề sai