\(n_{H_2}=\frac{0,672}{22,4}=0,03\left(mol\right)\)
PTHH: \(Ba+2H_2O\rightarrow Ba\left(OH\right)_2+H_2\)
_______a--------------------->a---------->a______(mol)
\(2Na+2H_2O\rightarrow2NaOH+H_2\)
_a----------------------->a------>0,5a_______(mol)
=> a + 0,5a = 0,03
=> a = 0,02 (mol)
PTHH: \(Ba\left(OH\right)_2+2HCl\rightarrow BaCl_2+2H_2O\)
________0,02-------->0,04_______________________(mol)
\(NaOH+HCl\rightarrow NaCl+H_2O\)
_0,02----->0,02_______________________(mol)
=> \(n_{HCl}=0,04+0,02=0,06\left(mol\right)\)
=> CM(HCl) = \(\frac{0,06}{0,1}=0,6\left(l\right)\)