\(n_{CuCl_2}=\dfrac{60,75}{135}=0,45mol\\ a)CuCl_2+2NaOH\rightarrow Cu\left(OH\right)_2+2NaCl\)
0,45           0,9              0,45                     0,9
\(b)m_X=m_{Cu\left(OH\right)_2}=0,45.81=36,45g\\ c)m_{ddNaOH}=\dfrac{0,9.40}{15\%}\cdot100\%=240g\\ d)m_{ddNaCl}=60,75+240-36,45=264,3g\\ C_{\%NaCl}=\dfrac{0,9.58,5}{264,3}\cdot100\%=19,92\%\\ e)n_{H_2SO_4}=\dfrac{245.20\%}{100\%.98}=0,5mol\\ H_2SO_4+Cu\left(OH\right)_2\rightarrow CuSO_4+2H_2O\\ \Rightarrow\dfrac{0,5}{1}>\dfrac{0,45}{1}\Rightarrow H_2SO_4.dư\)
\(\Rightarrow\)Dung dịch acid \(H_2SO_4\) làm tan hết chất X\(\left(Cu\left(OH\right)_2\right)\)

PTHH: \(CuCl_2+2NaOH\rightarrow2NaCl+Cu\left(OH\right)_2\downarrow\)

            \(Cu\left(OH\right)_2\xrightarrow[]{t^o}CuO+H_2O\)

Ta có: \(n_{CuCl_2}=0,2\left(mol\right)\) \(\Rightarrow\left\{{}\begin{matrix}n_{Cu\left(OH\right)_2}=0,2\left(mol\right)=n_{CuO}\\n_{NaOH}=0,4\left(mol\right)=n_{NaCl}\end{matrix}\right.\)

\(\Rightarrow\left\{{}\begin{matrix}m_{Cu\left(OH\right)_2}=0,2\cdot98=19,6\left(g\right)\\m_{CuO}=0,2\cdot80=16\left(g\right)\\m_{NaCl}=0,4\cdot58,5=23,4\left(g\right)\\C\%_{NaOH}=\dfrac{0,4\cdot40}{200}\cdot100\%=8\%\end{matrix}\right.\)

\(n_{CuCl_2}=0,3.0,5=0,15\left(mol\right)\)

PT: \(CuCl_2+2NaOH\rightarrow2NaCl+Cu\left(OH\right)_2\)

Theo PT: \(n_{Cu\left(OH\right)_2}=n_{CuCl_2}=0,15\left(mol\right)\Rightarrow m_{Cu\left(OH\right)_2}=0,15.98=14,7\left(g\right)\)

\(n_{NaOH}=2n_{CuCl_2}=0,3\left(mol\right)\)

\(\Rightarrow C_{M_{NaOH}}=\dfrac{0,3}{0,25}=1,2\left(M\right)\)

a.CuCl2 + 2NaOH -> Cu(OH)2 + 2NaCl

     0.15        0.3            0.15            0.3

Cu(OH)2 -> CuO + H2O

  0.15            0.15

nNaOH = 0.3 mol

\(CM_{CuCl2}=\dfrac{0.15}{2}=0.075M\)

b.Vdd sau phản ứng = 0.2 + 0.15 = 0.35l

\(CM_{NaCl}=\dfrac{0.3}{0.35}=0.86M\)

c.mCuO = \(0.15\times80=12g\)

\(a,PTHH:CuCl_2+2KOH\rightarrow Cu\left(OH\right)_2+2KCl\\ ...0,2......0,4.......0,2........0,4\left(mol\right)\\ b,n_{CuCl_2}=\dfrac{27}{135}=0,2\left(mol\right)\\ m_{Cu\left(OH\right)_2}=0,2\cdot98=19,6\left(g\right)\\ c,m_{KOH}=0,4\cdot56=22,4\left(g\right)\\ m_{dd_{KOH}}=\dfrac{22,4\cdot100\%}{20\%}=112\left(g\right)\\ m_{dd_{KCl}}=m_{CuCl_2}+m_{dd_{KOH}}-m_{Cu\left(OH\right)_2}=27+112-19,6=119,4\left(g\right)\)

\(d,C\%_{dd_{KCl}}=\dfrac{74,5\cdot0,4}{119,4}\cdot100\%\approx24,96\%\)

\(a)2NaOH+CuCl_2\rightarrow Cu\left(OH\right)_2+2NaCl\\ b)n_{NaOH}=\dfrac{4}{40}=0,1mol\\ n_{CuCl_2}=n_{Cu\left(OH\right)_2}=0,1:2=0,05mol\\ m_{ddCuCl_2}=\dfrac{0,05.135}{10}\cdot100=67,5g\\ c)n_{NaCl}=n_{NaOH}=0,1mol\\ C_{\%NaCl}=\dfrac{0,1.58,5}{\dfrac{4}{10}\cdot100+67,5-0,05.98}\cdot100=14,0625\%\)

a, \(CuCl_2+2NaOH\rightarrow2NaCl+Cu\left(OH\right)_2\)

\(Cu\left(OH\right)_2\underrightarrow{t^o}CuO+H_2O\)

b, \(n_{CuCl_2}=\dfrac{27}{135}=0,2\left(mol\right)\)

Theo PT: \(n_{CuO}=n_{Cu\left(OH\right)_2}=n_{CuCl_2}=0,2\left(mol\right)\)

\(\Rightarrow m_{CuO}=0,2.80=16\left(g\right)\)

c, \(n_{NaOH}=2n_{CuCl_2}=0,4\left(mol\right)\)

\(\Rightarrow C\%_{NaOH}=\dfrac{0,4.40}{200}.100\%=8\%\)

\(a,2NaOH+MgSO_4\rightarrow Mg\left(OH\right)_2+Na_2SO_4\\ n_{NaOH}=0,5.1=0,5\left(mol\right)\\ b,n_{Mg\left(OH\right)_2}=\dfrac{0,5}{2}=0,25\left(mol\right)=n_{Na_2SO_4}\\ m_{kt}=m_{Mg\left(OH\right)_2}=58.0,25=14,5\left(g\right)\\ c,V_{ddX}=V_{ddNaOH}+V_{ddMgSO_4}=0,5+0,5=1\left(l\right)\\ C_{MddNa_2SO_4}=\dfrac{0,25}{1}=0,25\left(M\right)\)