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a) (mol).
=> = 0,464M.
b) Fe + CuSO4 -> FeSO4 + Cu
0,232 (mol).
=> mFe = 0,232.56 = 12,992 gam.
a) (mol).
=> = 0,464M.
b) Fe + CuSO4 -> FeSO4 + Cu
0,232 (mol).
=> mFe = 0,232.56 = 12,992 gam.
\(a.n_{CuSO_4}=n_{CuSO_4.5H_2O}=\dfrac{58}{250}=0,232\left(mol\right)\\ \Rightarrow CM_{CuSO_4}=\dfrac{0,232}{0,5}=0,464M\\ b.Fe+CuSO_4\rightarrow FeSO_4+Cu\\ 50mlddAcó0,0232molCuSO_4\\ n_{Fe}=n_{CuSO_4}=0,0232\left(mol\right)\\ \Rightarrow m_{Fe}=0,0232.56=1,2992\left(g\right)\)
Fe + CuSO4 → FeSO4 + Cu.
nFe = nCuSO4 = 0,232 mol.
mFe = 0,232 x 56 = 12,992g.
\(n_{CuSO_4.5H_2O}=\dfrac{25}{250}=0,1\left(mol\right)\\ \Rightarrow n_{CuSO_4}=0,1\left(mol\right)\\ CuSO_4+Fe\rightarrow FeSO_4+Cu\\ n_{Fe}=n_{CuSO_4}=0,1\left(mol\right)\\ m_{Fe}=0,1.56=5,6\left(g\right)\)
a)
C% CuSO4 = 16/(16 + 184) .100% = 8%
b)
n NaOH = 20/40 = 0,5(mol)
CM NaOH = 0,5/4 = 0,125M
a, \(n_{Fe}=\dfrac{8,4}{56}=0,15\left(mol\right)\)
\(m_{CuCl_2}=270.10\%=27\left(g\right)\Rightarrow n_{CuCl_2}=\dfrac{27}{135}=0,2\left(mol\right)\)
Ta có: \(\dfrac{0,15}{1}< \dfrac{0,2}{1}\) ⇒ Fe hết, CuCl2 dư
PTHH: Fe + CuCl2 ---> FeCl2 + Cu
Mol: 0,15 0,15 0,15 0,15
\(a=m_{Cu}=0,15.64=9,6\left(g\right)\)
b, \(m_{dd.sau.pứ}=8,4+270-9,6=268,8\left(g\right)\)
\(m_{CuCl_2dư}=\left(0,2-0,15\right).135=6,75\left(g\right)\)
\(\left\{{}\begin{matrix}C\%_{CuCl_2dư}=\dfrac{6,75.100\%}{268,8}=2,51\%\\C\%_{FeCl_2}=\dfrac{0,15.127.100\%}{268,8}=7,09\%\end{matrix}\right.\)
c, \(V_{ddCuCl_2}=\dfrac{270}{1,35}=200\left(ml\right)=0,2\left(l\right)\)
\(\left\{{}\begin{matrix}C_{M_{CuCl_2dư}}=\dfrac{0,2-0,15}{0,2}=0,25M\\C_{M_{FeCl_2}}=\dfrac{0,15}{0,2}=0,75M\end{matrix}\right.\)
a) Ta có: \(n_{NaCl}=\dfrac{5,85}{58,5}=0,1\left(mol\right)\)
\(\Rightarrow C_{M_{NaCl}}=\dfrac{0,1}{0,5}=0,2\left(M\right)=\left[Na^+\right]=\left[Cl^-\right]\)
b) Ta có: \(n_{Ba\left(OH\right)_2}=\dfrac{34,2}{171}=0,2\left(mol\right)\)
\(\Rightarrow C_{M_{Ba\left(OH\right)_2}}=\dfrac{0,2}{0,5}=0,4\left(M\right)\) \(\Rightarrow\left\{{}\begin{matrix}\left[Ba^{2+}\right]=0,4\left(M\right)\\\left[OH^-\right]=0,8\left(M\right)\end{matrix}\right.\)
c) Ta có: \(n_{H_2SO_4}=0,025\cdot2=0,05\left(mol\right)\)
\(\Rightarrow C_{M_{H_2SO_4}}=\dfrac{0,05}{0,125+0,025}\approx0,33\left(M\right)\) \(\Rightarrow\left\{{}\begin{matrix}\left[H^+\right]=0,66\left(M\right)\\\left[SO_4^{2-}\right]=0,33\left(M\right)\end{matrix}\right.\)
a)
(mol).
=>
= 0,464M.
b) Fe + CuSO4 -> FeSO4 + Cu
=> mFe = 0,232.56 = 12,992 gam.