Ta có : \(n_{Ba}=\frac{27.4}{137}=0,2\left(mol\right)\)
\(n_{CuSO4}=\frac{400.3,2}{100.160}=0,08\left(mol\right)\)
\(\text{+ PTHH: Ba + 2 H 2 O→ B a ( O H ) 2 + H 2 ↑}\)
...............0,2....................................0,2................0,2.........(mol)
\(\text{B a ( O H ) 2 + C u S O 4 → B a S O 4 ↓+ C u ( O H ) 2 ↓}\)
0,8.............................0,8..............0,8...................0,8.......................(mol)
\(\Rightarrow V_{H2}=0,2.22,4=4,48l\)
+ Chất rắn sau nung:\(\left\{{}\begin{matrix}BaSO4:0,08\left(mol\right)\\CuO:0,08\left(mol\right)\end{matrix}\right.\)
\(\Rightarrow m_{\text{Chất rắn}}=\text{0.08x233+ 0.08x80=25.04 g}\)
+mddsaupư= 27.4+ 400- 0.2x2-0.08x233-0.08x98=400.52 g
\(\Rightarrow C\%_{Ba\left(OH\right)2}_{\text{dư}}=\frac{0,12.171}{400.52}.100\%=5,1\%\)
