H2SO4 + BaCl2 → BaSO4↓ + 2HCl
\(n_{H_2SO_4}=0,5\times2=1\left(mol\right)\)
Theo PT: \(n_{BaSO_4}=n_{H_2SO_4}=1\left(mol\right)\)
\(\Rightarrow m_{BaSO_4}=1\times233=233\left(g\right)\)
Theo PT: \(n_{HCl}=2n_{H_2SO_4}=2\times1=2\left(mol\right)\)
\(\Rightarrow m_{HCl}=2\times36,5=73\left(g\right)\)