a, \(n_{Zn}=\dfrac{26}{65}=0,4\left(mol\right)\)
PT: \(Zn+2HCl\rightarrow ZnCl_2+H_2\)
Theo PT: \(n_{H_2}=n_{Zn}=0,4\left(mol\right)\Rightarrow m_{H_2}=0,4.2=0,8\left(g\right)\)
b, \(2H_2+O_2\underrightarrow{^{t^o}}2H_2O\)
Theo PT: \(n_{O_2}=\dfrac{1}{2}n_{H_2}=0,2\left(mol\right)\Rightarrow V_{O_2}=0,2.22,4=4,48\left(l\right)\)
\(\Rightarrow V_{kk}=5V_{O_2}=22,4\left(l\right)\)