a: \(H_2SO_4+BaCl_2\rightarrow2HCl+BaSO_4\)
0,15 0,1
=>H2SO4 dư
\(n_{BaSO_4}=0.1\left(mol\right)\)
\(m_{BaSO4}=0.1\cdot234=23.4\left(g\right)\)
b: \(n_{H^+\left(dư\right)}=0.15-0.1=0.05\left(mol\right)\)
\(V_{saudd}=0.1+0.1=0.2\left(lít\right)\)
\(C_{M\left(HCl\right)}=\dfrac{0.05}{0.2}=0.25\left(M\right)\)