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200ml = 0,2l
\(n_{KOH}=1.0,2=0,2\left(mol\right)\)
Pt : \(2KOH+H_2SO_4\rightarrow K_2SO_4+2H_2O|\)
2 1 1 2
0,2 0,1
\(n_{H2SO4}=\dfrac{0,2.1}{2}=0,1\left(mol\right)\)
⇒ \(m_{H2SO4}=0,1.98=9,8\left(g\right)\)
\(C_{ddH2SO4}=\dfrac{9,8.100}{49}=20\)0/0
Chúc bạn học tốt
a, \(n_{KOH}=0,3.1=0,3\left(mol\right)\)
PT: \(2KOH+H_2SO_4\rightarrow K_2SO_4+2H_2O\)
Theo PT: \(n_{K_2SO_4}=\dfrac{1}{2}n_{KOH}=0,15\left(mol\right)\)
\(\Rightarrow m_{K_2SO_4}=0,15.174=26,1\left(g\right)\)
b, \(C_{M_{K_2SO_4}}=\dfrac{0,3}{0,3+0,2}=0,6\left(M\right)\)
nK2SO3=15.8\158=0.1(mol)
K2SO3+H2SO4→K2SO4+SO2+H2O
0.1...........................0.1..........0.1
VSO2=0.1⋅22.4=2.24(l)
CMK2SO4=0.1\0.2=0.5(M)
a, \(2NaOH+H_2SO_4\rightarrow Na_2SO_4+2H_2O\)
\(2KOH+H_2SO_4\rightarrow K_2SO_4+2H_2O\)
Ta có: 40nNaOH + 56nKOH = 25,44 (1)
\(n_{H_2SO_4}=\dfrac{1}{2}n_{NaOH}+\dfrac{1}{2}n_{KOH}=0,3.0,9=0,27\left(mol\right)\left(2\right)\)
Từ (1) và (2) \(\Rightarrow\left\{{}\begin{matrix}n_{NaOH}=0,3\left(mol\right)\\n_{KOH}=0,24\left(mol\right)\end{matrix}\right.\)
\(\Rightarrow\left\{{}\begin{matrix}m_{NaOH}=0,3.40=12\left(g\right)\\m_{KOH}=0,24.56=13,44\left(g\right)\end{matrix}\right.\)
b, \(m_{ddH_2SO_4}=300.1,14=342\left(g\right)\)
\(\Rightarrow C\%_{H_2SO_4}=\dfrac{0,27.98}{342}.100\%\approx7,74\%\)
PTHH:\(CaO+H_2SO_4\rightarrow CaSO_4+H_2O \)
tl 1 : 1 : 1 : 1 (mol)
br \(\dfrac{1}{7}\) -> \(\dfrac{1}{7}\)
n\(_{CaO}=\dfrac{8}{56}=\dfrac{1}{7}\left(mol\right)\)
Đổi 200ml=0,2l
=>\(C_{MH_2SO_4}=\dfrac{\dfrac{1}{7}}{0,2}=\dfrac{5}{7}\left(M\right)\)
\(n_{CaO}=\dfrac{m}{M}=\dfrac{8}{56}=0,14\left(mol\right)\)
PTHH:\(CaO+H_2SO_4\rightarrow CaSO_4+H_2O\)
0,14 0,14
\(CM=\dfrac{n_{ct}}{V_{dd}}=\dfrac{0,14}{0,2}=0,7\left(M\right)\)
\(n_{Al\left(OH\right)_3}=\dfrac{7,8}{78}=0,1mol\\ 2Al\left(OH\right)_3+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+6H_2O\\ 0,1................0,15.............0,05............0,3\\ C_{\%H_2SO_4}=\dfrac{0,15.98}{300}\cdot100\%=4,9\%\\ C_{\%Al_2\left(SO_4\right)_3}=\dfrac{0,05.342}{7,8+300}\cdot100\%=5,56\%\)
\(n_{Fe}=\dfrac{5,6}{56}=0,1\left(mol\right)\)
PTHH: Fe + H2SO4 → FeSO4 + H2
Mol: 0,1 0,1
\(C\%_{ddH_2SO_4}=\dfrac{0,1.98.100\%}{100}=9,8\%\)
200ml = 0,2l
\(n_{KOH}=1.0,2=0,2\left(mol\right)\)
Pt : \(2KOH+H_2SO_4\rightarrow K_2SO_4+2H_2O|\)
2 1 1 2
0,2 0,1
\(n_{H2SO4}=\dfrac{0,2.1}{2}=0,1\left(mol\right)\)
⇒ \(m_{H2SO4}=0,1.98=9,8\left(g\right)\)
\(C_{ddH2SO4}=\dfrac{9,8.100}{49}=20\)0/0
Chúc bạn học tốt