Anh làm lại bài nha, kẻo em lại nhập kết quả sai!
\(n_{Al}=\dfrac{m_{Al}}{M_{Al}}=\dfrac{4,5}{27}=\dfrac{1}{6}\left(mol\right)\\ PTHH:4Al+3O_2\rightarrow\left(t^o\right)2Al_2O_3\\ n_{Al_2O_3}=\dfrac{\dfrac{1}{6}}{2}=\dfrac{1}{12}\left(mol\right)\\ \Rightarrow m_{Al_2O_3}=\dfrac{102.1}{12}=8,5\left(g\right)\)
\(n_{Al}=\dfrac{4,5}{27}=0,16\left(mol\right)\)
PTHH : 2Al + 3O2 -> 2Al2O3
0,16----------- 0,16 ( mol )
\(m_{Al_2O_3}=0,16.102=16,32\left(g\right)\)
\(n_{Al}=\dfrac{4,5}{27}=\dfrac{1}{6}\left(mol\right)\\ PTHH:4Al+3O_2\underrightarrow{t^o}2Al_2O_3\)
1/6 1/8 1/3
\(m_{Al_2O_3}=\dfrac{1}{3}.102=34\left(g\right)\)
Cho mk sửa lại
\(n_{Al}=\dfrac{4,5}{27}=0,16\left(mol\right)\)
PTHH : 4Al + 3O2 -> 2Al2O3
0,16 0,08
\(m_{Al_2O_3}=0,08.102=8,16\left(g\right)\)