\(n_{CuO}=\dfrac{32}{80}=0,4(mol)\\ CuO+2HCl\to CuCl_2+H_2\\ \Rightarrow n_{HCl}=0,8(mol);n_{CuCl_2}=n_{H_2}=0,4(mol)\\ a,m_{dd_{HCl}}=\dfrac{0,8.36,5}{20\%}=146(g)\\ b,m_{CuCl_2}=0,4.135=54(g)\\ c,C\%_{CuCl_2}=\dfrac{54}{32+146-0,4.2}.100\%=30,47\%\)
\(CuO + 2HCl \rightarrow CuCl_2 + H_2O\)
\(n_{CuO}= \dfrac{32}{80}= 0,4 mol\)
Theo PTHH:
\(n_{HCl}= 2n_{CuO}= 0,8 mol\)
\(\Rightarrow m_{HCl}= 0,8 . 36,5=29,2 g\)
\(\rightarrow m_{dd HCl}= \dfrac{29,2 . 100%}{20%}= 146 g\)
b) Muối tạo thành là CuCl2
Theo PTHH:
\(n_{CuCl_2}= n_{CuO}= 0,4 mol\)
\(\Rightarrow m_{CuCl_2}= 0,4 . 135= 54g\)
c)
\(m_{dd sau pư}= m_{CuO} + m_{dd HCl}= 32 + 146=178 g\)
C%= \(\dfrac{54}{178} . 100\)%= 30,337 %
\(-\) \(n_{CuO}=\dfrac{32}{80}=0,4\left(mol\right)\)
\(pt:CuO+2HCl\rightarrow CUCl_2+H_2O\)
\(a,\)
\(-\) \(n_{HCl}=2.n_{CuO}=2.0,4=0,8\left(mol\right)\)
\(\rightarrow\) \(m_{HCl}=0,8.36,5=29,2\left(gam\right)\)
\(\Rightarrow\) \(m_{ddHCl}=29,2:20\%=146\left(gam\right)\)
\(b,\)
\(-\) \(n_{CuCl_2}=n_{CuO}=0,4\left(mol\right)\)
\(\rightarrow\) \(m_{CuCl_2}=0,4.135=54\left(gam\right)\)
\(c,\)
\(m_{ddsaupu}=32+146=178\left(gam\right)\)
\(\Rightarrow\) \(C\%_{CuCl_2}=\dfrac{54}{178}.100\%=30,34\%\)