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Ta có: \(n_{CuO}=\dfrac{40}{80}=0,5\left(mol\right)\)
PT: \(CuO+2HCl\rightarrow CuCl_2+H_2O\)
____0,5____________0,5 (mol)
a, \(m_{CuCl_2}=0,5.135=67,5\left(g\right)\)
b, Có: m dd sau pư = mCuO + m dd HCl = 40 + 200 = 240 (g)
\(\Rightarrow C\%_{CuCl_2}=\dfrac{67,5}{240}.100\%=28,125\%\)
Bạn tham khảo nhé!
\(n_{Al}=\dfrac{10.8}{27}=0.4\left(mol\right)\)
\(2Al+6HCl\rightarrow2AlCl_3+3H_2\)
\(0.4........1.2.........0.4..........0.6\)
\(m_{HCl}=1.2\cdot36.5=43.8\left(g\right)\)
\(m_{AlCl_3}=0.4\cdot133.5=53.4\left(g\right)\)
\(m_{dd}=10.8+100-0.6\cdot2=109.6\left(g\right)\)
\(C\%_{AlCl_3}=\dfrac{53.4}{109.6}\cdot100\%=48.72\%\)
\(n_{HCl}=0,1.0,2=0,02\left(mol\right)\)
Pt : \(2HCl+Ca\left(OH\right)_2\rightarrow CaCl_2+2H_2O\)
0,02---->0,01---------->0,01
a) Nồng độ mol đề cho rồi mà nhỉ
b) \(m_{muôi}=m_{CaCl2}=0,01.111=1,11\left(g\right)\)
\(n_{CuO}=\dfrac{16}{80}=0,2mol\)
\(CuO+2HCl\rightarrow CuCl_2+H_2O\)
0,2 0,4 0,2 0,2
\(C_{M_{HCl}}=\dfrac{n_{HCl}}{V_{HCl}}=\dfrac{0,4}{0,2}=2M\)
\(m_{HCl}=0,4\cdot36,5=14,6g\)
nCuO = 16/80 = 0,2 (mol)
PTHH: CuO + 2HCl -> CuCl2 + H2
Mol: 0,2 ---> 0,4 ---> 0,2 ---> 0,2
CMCuCl2 = 0,2/0,2 = 1M
mHCl = 0,4 . 36,5 = 14,6 (g)
Sửa đề : 11.2 g sắt
\(n_{Fe}=\dfrac{11.2}{56}=0.2\left(mol\right)\)
\(Fe+H_2SO_4\rightarrow FeSO_4+H_2\)
\(0.2....0.2.................0.2\)
\(m_{FeSO_4}=0.2\cdot152=30.4\left(g\right)\)
\(C_{M_{H_2SO_4}}=\dfrac{0.2}{0.05}=4\left(M\right)\)
\(n_{Na}=\dfrac{2,3}{23}=0,1\left(mol\right)\\ a,PTHH:2Na+H_2SO_4\rightarrow Na_2SO_4+H_2\\ b,n_{Na_2SO_4}=n_{H_2}=n_{H_2SO_4}=\dfrac{0,1}{2}=0,05\left(mol\right)\\ m_{Na_2SO_4}=142.0,05=7,1\left(g\right)\\ c,C\%_{ddH_2SO_4}=\dfrac{0,05.98}{4,9}.100\%=100\%\)
Thường C% < 100% ớ em
\(n_{Zn}=\dfrac{6,5}{65}=0,1\left(mol\right)\\ a,Zn+2HCl\rightarrow ZnCl_2+H_2\\ b,n_{ZnCl_2}=n_{Zn}=0,1\left(mol\right);n_{HCl}=2.0,1=0,2\left(mol\right)\\ m_{ZnCl_2}=136.0,1=13,6\left(g\right)\\ c,V_{ddHCl}=\dfrac{0,2}{2}=0,1\left(lít\right)\)
\(n_{Mg}=\dfrac{4,8}{24}=0,2\left(mol\right)\\
pthh:Mg+2HCl\rightarrow MgCl_2+H_2\uparrow\)
0,2 0,4 0,2
\(m_{MgCl_2}=0,2.95=19\left(g\right)\\
C\%_{HCl}=\dfrac{0,4.36,5}{200}.100\%=7,3\%\)
\(n_{CuO}=\dfrac{4}{80}=0,05\left(mol\right)\\a, CuO+H_2SO_4\rightarrow CuSO_4+H_2O\\ n_{CuSO_4}=n_{H_2SO_4}=n_{CuO}=0,05\left(MOL\right)\\ b,m_{CuSO_4}=0,05.160=8\left(g\right)\\ c,V_{ddH_2SO_4}=\dfrac{0,05}{0,5}=0,1\left(l\right)\\ d,V_{ddCuSO_4}=V_{ddH_2SO_4}=0,1\left(l\right)\\ C_{MddCuSO_4}=\dfrac{0,05}{0,1}=0,5\left(M\right)\)
a, \(KOH+HCl\rightarrow KCl+H_2O\)
b, \(n_{KOH}=\dfrac{11,2}{56}=0,2\left(mol\right)\)
\(n_{KCl}=n_{KOH}=0,2\left(mol\right)\Rightarrow m_{KCl}=0,2.74,5=14,9\left(g\right)\)
c, \(n_{HCl}=n_{KOH}=0,2\left(mol\right)\Rightarrow m_{HCl}=0,2.36,5=7,3\left(g\right)\)
\(\Rightarrow m_{ddHCl}=\dfrac{7,3}{40\%}=18,25\left(g\right)\)
làm rõ hơn đi bạn