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\(a) n_{CH_3COOH} = \dfrac{200.12\%}{60} = 0,4(mol)\\ 2CH_3COOH + CaCO_3 \to (CH_3COO)_2Ca + CO_2 + H_2O\\ n_{CaCO_3} = n_{CO_2} = \dfrac{1}{2}n_{CH_3COOH} = 0,2(mol)\\ \Rightarrow a = \dfrac{0,2.100}{100\%-20\%} =25(gam)\\ V_B = 0,2.22,4 = 4,48(lít)\\ b) m_{dd\ sau\ pư} = m_{CaCO_3} + m_{dd\ CH_3COOH} - m_{CO_2} = 0,2.100 + 200 - 0,2.2 = 219,6(gam)\\ C\%_{(CH_3COO)_2Ca} = \dfrac{0,2.158}{219,6}.100\% = 36\%\)
\(m_{NaOH}=\dfrac{200\cdot8}{100}=16\left(g\right)\Rightarrow n_{NaOH}=\dfrac{16}{40}=0,4mol\)
\(NaOH+HCl\rightarrow NaCl+H_2O\)
0,4 0,4 0,4 0,4
a)\(m_{HCl}=0,4\cdot36,5=14,6\left(g\right)\)
\(\Rightarrow m_{ddHCl}=\dfrac{14,6}{7,3}\cdot100=200\left(g\right)\)
b)\(m_{NaCl}=0,4\cdot58,5=23,4\left(g\right)\)
\(m_{H_2O}=0,4\cdot18=7,2\left(g\right)\)
\(m_{ddsau}=200+200-7,2=392,8\left(g\right)\)
\(\Rightarrow C\%=\dfrac{23,4}{392,8}\cdot100=5,96\%\)
c) \(n_{SO_2}=\dfrac{6,72}{22,4}=0,3mol\)
\(2NaOH+SO_2\rightarrow Na_2SO_4+H_2O\)
0,4 0,3 0,3 0,3
\(m_{Na_2SO_4}=0,3\cdot142=42,6\left(g\right)\)
\(a)n_{Fe}=\dfrac{5,6}{56}=0,1mol\\ n_{Mg}=\dfrac{4,8}{24}=0,2mol\\ Fe+2HCl\rightarrow FeCl_2+H_2\)
0,1 0,2 0,1 0,1
\(Mg+2HCl\rightarrow MgCl_2+H_2\)
0,2 0,4 0,2 0,2
\(V_{H_2}=\left(0,1+0,2\right).22,4=6,72l\\ b)V_{ddHCl}=\dfrac{0,2+0,4}{2}=0,3l\\ c)m_{muối}=0,1.127+95.0,2=31,7g\)
Bài 3 :
\(n_{Al}=\dfrac{2,7}{27}=0,1\left(mol\right)\)
Pt : \(2Al+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2|\)
2 3 1 3
0,1 0,15 0,05 0,15
a) \(n_{H2}=\dfrac{0,1.3}{2}=0,15\left(mol\right)\)
\(m_{H2}=0,15.2=0,3\left(g\right)\)
\(V_{H2\left(dktc\right)}=0,15.22,4=3,36\left(l\right)\)
b) \(n_{H2SO4}=\dfrac{0,1.3}{2}=0,15\left(mol\right)\)
⇒ \(m=0,15.98=14,7\left(g\right)\)
\(C_{ddH2SO4}=\dfrac{14,7.100}{200}=7,35\)0/0
c) \(n_{Al2\left(SO4\right)3}=\dfrac{0,15.1}{3}=0,05\left(mol\right)\)
⇒ \(m_{Al2\left(SO4\right)3}=0,05.342=17,1\left(g\right)\)
\(m_{ddspu}=2,7+200-0,3=302,4\left(g\right)\)
\(C_{Al2\left(SO4\right)3}=\dfrac{17,1.100}{302,4}=5,65\)0/0
Chúc bạn học tốt
Mình xin lỗi bạn nhé , bạn sửa lại giúp mình :
\(m_{ddspu}=2,7+200-0,3=202,4\left(g\right)\)
\(C_{Al2\left(SO4\right)3}=\dfrac{17,1.100}{202,4}=8,45\)0/0
PTHH: \(K_2CO_3+2HCl\rightarrow2KCl+CO_2\uparrow+H_2O\)
Ta có: \(n_{HCl}=\dfrac{200\cdot7,3\%}{36,5}=0,4\left(mol\right)\)
\(\Rightarrow\left\{{}\begin{matrix}n_{K_2CO_3}=n_{CO_2}=0,2\left(mol\right)\\n_{KCl}=0,4\left(mol\right)\end{matrix}\right.\) \(\Rightarrow\left\{{}\begin{matrix}m_{ddK_2CO_3}=\dfrac{0,2\cdot138}{13,8\%}=200\left(g\right)\\V_{CO_2}=0,2\cdot22,4=4,48\left(l\right)\\m_{KCl}=0,4\cdot74,5=29,8\left(g\right)\end{matrix}\right.\)
a)
$NH_4Cl+ NaOH \to NH_3 + H_2O$
$n_{NH_3} = n_{NaOH} = \dfrac{200.10\%}{40} = 0,5(mol)$
$V_{NH_3} = 0,5.22,4 = 11,2(lít)$
b)
Sau phản ứng :
$m_{dd} = 200 + 100 - 0,5.17 = 291,5(gam)$
$n_{NaCl} = n_{NaOH} = 0,5(mol)$
$C\%_{NaCl} = \dfrac{0,5.58,5}{291,5}.100\% = 10,03\%$