a. \(n_{Fe}=\dfrac{8,4}{56}=0,15\left(mol\right)\)
PTHH: \(Fe+2HCl\rightarrow FeCl_2+H_2\)
Theo PT ta có: \(n_{Fe}=n_{H_2}=0,15\left(mol\right)\)
\(\Rightarrow V_{H_2}=0,15.22,4=3,36\left(l\right)\)
b. \(n_{CuO}=\dfrac{16}{80}=0,2\left(mol\right)\)
PTHH: \(H_2+CuO\rightarrow Cu+H_2O\)
Theo PT ta có tỉ lệ:
\(\dfrac{0,15}{1}< \dfrac{0,2}{1}\) => CuO dư. \(H_2\) hết => tính theo \(n_{H_2}\)
\(n_{Cu}=n_{H_2}=0,15\left(mol\right)\)
\(\Rightarrow m_{Cu}=0,15.64=9,6\left(g\right)\)
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