Đề bài phải là "dung dịch natri hiđroxit 0,5 mol/ lít" chứ bạn nhỉ?
a, PT: \(FeCl_3+3NaOH\rightarrow Fe\left(OH\right)_{3\downarrow}+3NaCl\)
\(CuCl_2+2NaOH\rightarrow Cu\left(OH\right)_{2\downarrow}+2NaCl\)
\(2Fe\left(OH\right)_3\underrightarrow{t^o}Fe_2O_3+3H_2O\)
\(Cu\left(OH\right)_2\underrightarrow{t^o}CuO+H_2O\)
b, Theo PT: \(\Sigma n_{NaOH}=3n_{FeCl_3}+2n_{CuCl_2}=0,1\left(mol\right)\)
\(\Rightarrow V_{ddNaOH}=\frac{0,1}{0,5}=0,2\left(l\right)\)
c, Theo PT: \(\left\{{}\begin{matrix}n_{Fe_2O_3}=\frac{1}{2}n_{FeCl_3}=0,01\left(mol\right)\\n_{CuO}=n_{CuCl_2}=0,02\left(mol\right)\end{matrix}\right.\)
\(\Rightarrow M=m_{Fe_2O_3}+m_{CuO}=0,01.160+0,02.80=3,2\left(g\right)\)
Bạn tham khảo nhé!