bổ sung thêm vào câu a: biết rằng có 6,72 lít khí hidro
Zn + 2HCl → ZnCl2 + H2↑
\(n_{H_2}=\dfrac{6,72}{22,4}=0,3\left(mol\right)\)
a) Theo PT: \(n_{Zn}=n_{H_2}=0,3\left(mol\right)\)
\(\Rightarrow m_{Zn}=0,3\times65=19,5\left(g\right)\)
b) Theo PT: \(n_{ZnCl_2}=n_{H_2}=0,3\left(mol\right)\)
\(\Rightarrow m_{ZnCl_2}=0,3\times136=40,8\left(g\right)\)
c) Theo PT: \(n_{HCl}pư=2n_{H_2}=2\times0,3=0,6\left(mol\right)\)
\(\Rightarrow m_{HCl}pư=0,6\times36,5=21,9\left(g\right)\)
\(m_{HCl}dư=1\times36,5=36,5\left(g\right)\)
\(\Rightarrow m_{HCl}bđ=21,9+36,5=58,4\left(g\right)\)
