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PT: \(CuO+H_2SO_4\rightarrow CuSO_4+H_2O\)
\(Cu+2H_2SO_{4\left(đ\right)}\underrightarrow{t^o}CuSO_4+SO_2+2H_2O\)
Ta có: \(n_{SO_2}=\dfrac{5,6}{22,4}=0,25\left(mol\right)\)
Theo PT: \(n_{Cu}=n_{SO_2}=0,25\left(mol\right)\)
\(\Rightarrow\%m_{Cu}=\dfrac{0,25.64}{24}.100\%\approx66,67\%\)
a)
H2SO4(loãng, dư)+CuO→ H2O+ CuSO4(1)
(mol)
H2SO4(loãng, dư)+Cu→không phản ứng
Cu+ 2H2SO4(đặc, nóng)→ CuSO4+ SO2+ 2H2O(2)
(mol) 0,15 0,3 0,15 0,15
b)
\(n_{SO_2}=\dfrac{V}{22,4}=\dfrac{3,36}{22,4}=0,15\left(mol\right)\)
\(m_{Cu}=n.M=0,15.64=9,6\left(gam\right)\)
→\(m_{CuO}=m_{hh}-m_{Cu}=17,6-9,6=8\left(gam\right)\)
=>\(C\%_{Cu}=\dfrac{9,6}{17,6}.100\%=54,54\%\)
\(C\%_{CuO}=\dfrac{8}{17,6}.100\%=0,45\%\)
a)
$Cu + 2H_2SO_4 \to CuSO_4 + SO_2 + 2H_2O$
$n_{Cu} = n_{SO_2} = \dfrac{1,12}{22,4} = 0,05(mol)$
$\%m_{Cu} = \dfrac{0,05.64}{10}.100\% = 32\%$
$\%m_{CuO} = 100\% -32\% = 68\%$
b)
$NaOH + SO_2 \to NaHSO_3$
$n_{NaOH} = n_{SO_2} = 0,05(mol)$
$V_{dd\ NaOH} = \dfrac{0,05}{2} = 0,025(lít) = 25(ml)$
\(CuO+H_2SO_{4\left(24,5\%\right)}\rightarrow CuSO_4+H_2O\)
\(Cu+2H_2SO_{4đ}\underrightarrow{t^o}CuSO_4+SO_2+2H_2O\)
\(n_{SO_2}=\dfrac{1,12}{22,4}=0,05\left(mol\right)\)
\(\Rightarrow n_{Cu}=0,05\left(mol\right)\)
\(\Rightarrow m_{CuO}=10-64.0,05=6,8\left(g\right)\)
\(\Rightarrow n_{CuO}=0,085\left(mol\right)\)
\(\Rightarrow n_{H_2SO_4\left(24,5\%\right)}=0,085\left(mol\right)\)
\(\Rightarrow m_{H_2SO_4\left(24,5\%\right)}=8,33\left(g\right)\)
\(\Rightarrow m_{ddH_2SO_4\left(24,5\%\right)}=34\left(g\right)\)
\(n_{H_2}=\dfrac{8,96}{22,4}=0,4\left(mol\right)\)
PTHH: Fe + H2SO4 → FeSO4 + H2
Mol: 0,4 0,4
\(m_{Fe}=0,4.56=22,4\left(g\right)\)
\(m_{hh}=22,4+5=27,4\left(g\right)\)
\(\%m_{Fe}=\dfrac{22,4.100\%}{27,4}=81,75\%;\%m_{Cu}=100-81,75=18,25\%\)
a. PTHH:
\(Cu+H_2SO_4--\times-->\)
\(CuO+H_2SO_4--->CuSO_4+H_2O\left(1\right)\)
\(Cu+2H_2SO_{4_{đặc}}\overset{t^o}{--->}CuSO_4+SO_2+2H_2O\left(2\right)\)
Ta có: \(n_{SO_2}=\dfrac{1,12}{22,4}=0,05\left(mol\right)\)
Theo PT(2): \(n_{Cu}=n_{SO_2}=0,05\left(mol\right)\)
\(\Rightarrow m_{Cu}=0,05.64=3,2\left(g\right)\)
\(\Rightarrow\%_{m_{Cu}}=\dfrac{3,2}{10}.100\%=32\%\)
\(\%_{m_{CuO}}=100\%-32\%=68\%\)