\(m_{H_2SO_4}=9.8\left(g\right)\)
\(n_{H_2SO_4}=\dfrac{9.8}{98}=0.1\left(mol\right)\)
\(Đặt:n_{Ba\left(1\right)}=a\left(mol\right)\)
\(Ba+H_2SO_4\rightarrow BaSO_4+H_2\)
\(0.1........0.1.........0.1.........0.1\)
\(Ba+2H_2O\rightarrow Ba\left(OH\right)_2+H_2\left(1\right)\)
\(a..................a........a\)
\(m_{Ba\left(OH\right)_2}=171a\left(g\right)\)
\(m_{dd}=m_{Ba}+m_{ddH_2SO_4}-m_{H_2}-m_{BaSO_4}=\left(0.1+a\right)\cdot137+200-23.3-\left(0.1+a\right)\cdot2=190.2+136.8a\left(g\right)\)
\(C\%Ba\left(OH\right)_2=\dfrac{171a}{190.2+136.8a}\cdot100\%=2.51\%\)
\(\Leftrightarrow a=0.028\)
\(m_{Ba}=\left(0.1+0.028\right)\cdot137=17.536\left(g\right)\)
Số mình ra hơi lẻ chút ,hông biết đúng hay sai. Bạn xem thử nha
