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a, \(CuO+2HCl\rightarrow CuCl_2+H_2O\)
b, \(n_{HCl}=0,2.0,5=0,1\left(mol\right)\)
Theo PT: \(n_{CuO}=n_{CuCl_2}=\dfrac{1}{2}n_{HCl}=0,05\left(mol\right)\)
\(\Rightarrow m_{CuO}=0,05.80=4\left(g\right)\)
c, \(C_{M_{CuCl_2}}=\dfrac{0,05}{0,2}=0,25\left(M\right)\)
\(n_{HCl}=0,2.0,5=0,1\left(mol\right)\)
PTHH :
\(CuO+2HCl\rightarrow CuCl_2+H_2O\)
0,05 0,1 0,05
\(b,m_{CuO}=0,05.80=4\left(g\right)\)
\(c,C_{M\left(CuCl_2\right)}=\dfrac{0,05}{0,2}=0,25\left(M\right)\)
nNaOH = 0,2 . 2,5 = 0,5 (mol)
PTHH:
CH3COOH + NaOH -> CH3COONa + H2O
Mol: 0,5 <--- 0,5 ---> 0,5
VddCH3COOH = 0,5/2 = 0,25 (l)
VddCH3COONa = 0,25 + 0,2 = 0,45 (l)
CMddCH3COONa = 0,5/,045 = 1,11M
PT: \(CH_3COOH+NaOH\rightarrow CH_3COONa+H_2O\)
Ta có: \(n_{CH_3COONa}=\dfrac{9,84}{82}=0,12\left(mol\right)\)
Theo PT: \(n_{CH_3COOH}=n_{NaOH}=n_{CH_3COONa}=0,12\left(mol\right)\)
\(\Rightarrow V_{ddCH_3COOH}=\dfrac{0,12}{0,5}=0,24\left(l\right)\)
\(m_{NaOH}=0,12.40=4,8\left(g\right)\Rightarrow m_{ddNaOH}=\dfrac{4,8}{20\%}=24\left(g\right)\)
nHCl=0,3.2=0,6(mol)
a) PTHH: CuO +2 HCl -> CuCl2 + H2O
0,3_______________0,6___0,3(mol)
b) mCuO=0,3.80=24(g)
c) VddCuCl2=VddHCl=0,3(l)
=>CMddCuCl2=0,3/0,3=1(M)
d) m(muối)=0,3.135=40,5(g)
PTHH: \(H_2SO_4+2KOH\rightarrow K_2SO+2H_2O\)
Ta có: \(n_{H_2SO_4}=0,2\cdot1=0,2\left(mol\right)\)
\(\Rightarrow\left\{{}\begin{matrix}n_{KOH}=0,4\left(mol\right)\\n_{K_2SO_4}=0,2\left(mol\right)\end{matrix}\right.\) \(\Rightarrow\left\{{}\begin{matrix}V_{ddKOH}=\dfrac{\dfrac{0,4\cdot56}{6\%}}{1,048}\approx356,2\left(ml\right)\\C_{M_{K_2SO_4}}=\dfrac{0,2}{0,2+0,3562}\approx0,36\left(M\right)\end{matrix}\right.\)
\(n_{H_2SO_4}=1.0,2=0,2\left(mol\right)\\ H_2SO_4+2KOH\rightarrow K_2SO_4+2H_2O\\ 0,2.........0,4........0,2.......0,2\left(mol\right)\\ a.m_{ddKOH}=\dfrac{0,4.56.100}{6}=\dfrac{1120}{3}\left(g\right)\\ V_{ddKOH}=\dfrac{\dfrac{1120}{3}}{1,048}=\dfrac{140000}{393}\left(ml\right)\approx0,356\left(l\right)\)
\(b.C_{MddK_2SO_4}=\dfrac{0,2}{\dfrac{140000}{393}+0,2}\approx0,00056\left(M\right)\)
câu 1
a) CuO+H2SO4-->CuSO4 + H2O
\(m_{h2so4}=196.5\%=9.6\left(g\right)\)
\(n_{h2so4}=\dfrac{9.8}{98}=0.1\left(mol\right)\)
\(n_{CuO}=n_{h2SO4}=0.1\left(mol\right)\)
\(m_{CuO}=80\cdot0,1=8\left(g\right)\)
b)
\(m_{CuSO4}=160\cdot0,1=16\left(g\right)\)
\(m_{ddCuSO4}=8+196=204\left(g\right)\)
\(C\%_{MgSO4}=\dfrac{16}{204}\cdot100\%=7,84\%\)
c)\(n_{MgO}=n_{H2SO4}=0.1\left(mol\right)\)
\(m_{MgO}=n\cdot M=0.1\cdot40=4\left(g\right)\)
Bài 1:
PTHH: \(BaO+H_2SO_4\rightarrow BaSO_4+H_2O\)
Bđ____0,05___0,2
Pư____0,05___0,05_______0,05
Kt____0______0,15_______0,05
\(m_{kt}=m_{BaSO_4}=0,05.233=11,65\left(g\right)\)
\(m_{ddsaupư}=7,65+200-11,65=196\left(g\right)\)
\(C\%ddH_2SO_4=7,5\%\)
Bài 2: \(Fe_2O_3+6HCl\rightarrow2FeCl_3+3H_2O\)
bđ___0,1_______0,5
pư__1/12_______0,5_____1/6
kt ___1/60______0_______1/6
\(m_{FeCl_3}=\dfrac{1}{6}.162,5\approx27g\)
\(C_{MddFeCl_3}=\dfrac{1}{6}:0,5\approx0,3M\)
a, \(CuO+2CH_3COOH\rightarrow\left(CH_3COO\right)_2Cu+H_2O\)
b, \(n_{CuO}=\dfrac{8}{80}=0,1\left(mol\right)\)
Theo PT: \(n_{CH_3COOH}=2n_{CuO}=0,2\left(mol\right)\Rightarrow C_{M_{CH_3COOH}}=\dfrac{0,2}{0,2}=1\left(M\right)\)
c, \(n_{\left(CH_3COO\right)_2Cu}=n_{Cu}=0,1\left(mol\right)\Rightarrow m_{\left(CH_3COO\right)_2Cu}=0,1.182=18,2\left(g\right)\)