PTHH: \(4Al+3O_2-^{t^o}\rightarrow2Al_2O_3\)
Theo đề bài ta có: \(n_{O_2}=\frac{3}{4}n_{Al}=\frac{3}{4}.\frac{5,4}{27}=0,15\left(mol\right)\)
\(\Rightarrow V_{O_2}=0,15.22,4=3,36\left(l\right)\)
b) Cách 1: \(n_{Al_2O_3}=\frac{1}{2}n_{Al}=0,1\left(mol\right)\)
\(\Rightarrow m_{Al_2O_3}=0,2.102=10,2\left(g\right)\)
Cách 2 : ADĐLBKL: \(m_{Al_2O_3}=m_{Al}+m_{O_2}=5,4+0,15.32=10,2\left(g\right)\)
\(PTHH:4Al+3O2\rightarrow2Al2O3\)
\(\text{Ta có}:nAl=0,2\left(mol\right)\)
\(\text{Theo PT}:nO2=0,2\text{ }.34=0,15\left(mol\right)\)
\(\Rightarrow VH2=0,15.22,4=3,36l\)
\(\text{nAl203=0,2/2=0,1(mol)}\)
\(\text{mAl2O3= 0,1.102=10,2(g)}\)
4Al + 3O2--->2Al2O3
a) n\(_{Al}=\frac{5,4}{27}=0,2\left(mol\right)\)
Theo pthh
n\(_{O2}=\frac{3}{4}n_{Al}=0,15\left(mol\right)\)
V\(_{O2}=0,15.22,4=3,36\left(l\right)\)
b) n\(_{Al2O3}=\frac{1}{2}n_{Al}=0,1\left(mol\right)\)
m\(_{Al2O3}=0,1.102=10,2\left(g\right)\)