1/
PTPƯ : \(2Cu+O_2\underrightarrow{t^o}2CuO\)
\(n_{Cu}=\frac{12,8}{64}=0,2\left(mol\right)\)
Theo pt : \(n_{CuO}=n_{Cu}=0,2\left(mol\right)\\ =>m_{CuO}=0,2.80=16g\)
2/
PTPỨ : \(Fe+2HCL\rightarrow FeCl_2+H_2\uparrow\)
\(n_{Fe}=\frac{11,2}{56}=0,2\left(mol\right)\)
Theo pt :
\(n_{H2}=n_{Fe}=0,2\left(mol\right)\\ \Rightarrow V_{H2}=0,2.22,4=4,48l\)
Theo pt :
\(n_{HCl}=2n_{Fe}=0,4\left(mol\right)\)
\(\Rightarrow m_{HCl}=0,4.36,5=14,6g\)
3/
PTPƯ : \(2Zn+O_2\underrightarrow{t^o}2ZnO\\ n_{Zn}=\frac{13}{65}=0,2\left(mol\right)\)
Theo pt : \(n_{ZnO}=n_{Zn}=0,2\left(mol\right)\)
\(\Rightarrow m_{ZnO}=0,2.81=16,2g\)