a. \(4Al+3O_2\rightarrow2AL_2O_3\) ( thêm nhiệt độ nữa nhé )
b,
\(n_{Al_2O_3}=\dfrac{m}{M}=\dfrac{2,04}{102}=0,02\left(mol\right)\)
Theo PTHH:
\(n_{Al}=2.n_{Al_2O_3}=2.0,02=0,04\left(mol\right)\)
\(\Rightarrow m_{Al}=n.M=0,04.27=1,08\left(g\right)\)
hay m = 1,08 (g)
c, Theo PTHH :
\(n_{O_2}=\dfrac{3}{2}.n_{Al_2O_3}=\dfrac{3}{2}.0,02=0,03\left(mol\right)\)
\(\Rightarrow V_{O_2}=n.22,4=0,03.22,4=0,672\left(l\right)\)