1. nó có easy quá mức k nhỉ :(( hay mình làm sai?
\(PTHH:4Al+3O_2\underrightarrow{t^o}2Al_2O_3\)
(mol)____0,4____0,3___
\(PTHH:2Al+3Cl_2\underrightarrow{t^o}2AlCl_3\)
(mol)____0,1____0,15__
\(m=27.\left(0,4+0,1\right)=13,5\left(g\right)\)
2.
Đặt \(n_{Al}=x\left(mol\right);n_{Cu}=y\left(mol\right)\)
\(PTHH:2Al+6H_2SO_{4\left(đ\right)}\underrightarrow{t^o}Al_2\left(SO_4\right)_3+3SO_2+6H_2O\)
(mol)_____x_____3x_________x/2__________1,5x___3x__
\(PTHH:Cu+2H_2SO_{4\left(đ\right)}\underrightarrow{t^o}CuSO_4+SO_2+2H_2O\)
(mol)_____y_____2y__________y_______y_____2y__
Theo đề bài ta có:
\(\left\{{}\begin{matrix}27x+64y=11,8\\22,4\left(1,5x+y\right)=8,96\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}x=0,2\\y=0,1\end{matrix}\right.\)
\(\Rightarrow\left\{{}\begin{matrix}\%m_{Al}=\frac{27.0,2}{11,8}.100\%=45,8\left(\%\right)\\\%m_{Cu}=100-45,8=54,2\left(\%\right)\end{matrix}\right.\)
