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n CO2=\(\dfrac{6,72}{22,4}\)=0,3 mol
n NaOH=\(2.0,225\)=0,45 mol
T=\(\dfrac{0,3}{0,45}\)=\(\dfrac{2}{3}\)
=>Tạo ra 2 muối NaHCO3 và Na2CO3
2NaOH+CO2->Na2CO3+H2O
0,45-------0,225-------0,225
Na2CO3+H2O+CO2->2NaHCO3
0,075------------0,075--------0,15 mol
=>m NaHCO3=0,15.84=12,6g
=>m Na2CO3= 0,15.106=15,9g
\(n_{H_2}=\dfrac{1,568}{22,4}=0,07\left(mol\right)\)
Gọi số mol Al, Fe là a, b
=> 27a + 56b = 2,78
2Al + 6HCl --> 2AlCl3 + 3H2
a------------------------->1,5a
Fe + 2HCl --> FeCl2 + H2
b--------------->b----->b
=> 1,5a + b = 0,07
=> a = 0,02; b = 0,04
=> mFeCl2 = 0,04.127 = 5,08 (g)
=> C
a, Mg + 2HCl \(\rightarrow\) MgCl2 + H2 Cu + 2HCl \(\rightarrow\) CuCl2 + H2
b, \(\left\{{}\begin{matrix}n_{Mg}=x\\n_{Cu}=y\end{matrix}\right.\Rightarrow\left\{{}\begin{matrix}24x+64y=16\\x+y=\dfrac{2,24}{22,4}\end{matrix}\right.\Rightarrow\left\{{}\begin{matrix}x=-0,24\\y=0,34\end{matrix}\right.\)
Xem lại đầu bài nha
\(a,n_{Na}=\dfrac{m_{Na}}{M_{Na}}=\dfrac{4,6}{23}=0,2\left(mol\right)\\ n_{Cl_2}=\dfrac{V_{Cl_2\left(đktc\right)}}{22,4}=\dfrac{4,48}{22,4}=0,2\left(mol\right)\\ PTHH:2Na+Cl_2\rightarrow2NaCl\\ Vì:\dfrac{0,2}{2}< \dfrac{0,2}{1}\Rightarrow Cl_2dư\\ \Rightarrow n_{Cl_2\left(dư\right)}=0,2-\dfrac{0,2}{2}=0,1\left(mol\right)\\ \Rightarrow m_{Cl_2\left(dư\right)}=0,1.71=7,1\left(g\right)\\ b,n_{NaCl}=n_{Na}=0,2\left(mol\right)\\ \Rightarrow m_{NaCl}=58,5.0,2=11,7\left(g\right)\)
a) \(n_{CO_2}=\dfrac{13,44}{22,4}=0,6\left(mol\right)\)
\(n_{NaOH}=2.0,2=0,4\left(mol\right)\)
Xét tỉ lệ \(\dfrac{n_{NaOH}}{n_{CO_2}}=\dfrac{0,4}{0,6}=0,67\) => Tạo ra muối NaHCO3
b)
PTHH: NaOH + CO2 --> NaHCO3
0,4------------->0,4
=> \(m_{NaHCO_3}=0,4.84=33,6\left(g\right)\)
a) \(n_{Cl_2}=\dfrac{4,48}{22,4}=0,2\left(mol\right)\)
PTHH: 2Fe + 3Cl2 --to--> 2FeCl3
_____\(\dfrac{2}{15}\)<--0,2------------->\(\dfrac{2}{15}\)
=> mFe = \(\dfrac{2}{15}.56=7,467\left(g\right)\)
b) \(m_{FeCl_3}=\dfrac{2}{15}.162,5=21,667\left(g\right)\)
a, \(Mg+2CH_3COOH\rightarrow\left(CH_3COO\right)_2Mg+H_2\)
b, \(n_{CH_3COOH}=\dfrac{3,6}{60}=0,06\left(mol\right)\)
Theo PT: \(n_{\left(CH_3COO\right)_2Mg}=n_{H_2}=\dfrac{1}{2}n_{CH_3COOH}=0,03\left(mol\right)\)
\(\Rightarrow m_{\left(CH_3COO\right)_2Mg}=0,03.142=4,26\left(g\right)\)
\(V_{H_2}=0,06.22,4=1,344\left(l\right)\)
a) $n_{CaCO_3} = 0,15(mol)$
$CaCO_3 + 2HCl \to CaCl_2 + CO_2 + H_2O$
$n_{HCl} = 2n_{CaCO_3} = 0,3(mol)$
$m_{dd\ HCl} = \dfrac{0,3.36,5}{7,3\%} = 150(gam)$
b)
$n_{CaCl_2} = n_{CO_2} = n_{CaCO_3} =0,15(mol)$
$V_{CO_2} = 0,15.22,4 = 3,36(lít)$
c)
$m_{dd} = 15 + 150 - 0,15.44 = 158,4(gam)$
$C\%_{CaCl_2} = \dfrac{0,15.111}{158,4}.100\% = 10,51\%$
Sửa đề: "3,36 lít CO2"
Ta có: \(\left\{{}\begin{matrix}n_{NaOH}=\dfrac{18}{40}=0,45\left(mol\right)\\n_{CO_2}=\dfrac{3,36}{22,4}=0,15\left(mol\right)\end{matrix}\right.\) \(\Rightarrow\) Tạo muối trung hòa
PTHH: \(CO_2+2NaOH\rightarrow Na_2CO_3+H_2O\)
Bazơ dư nên tính theo CO2
Theo PTHH: \(n_{Na_2CO_3}=0,15\left(mol\right)=n_{NaOH\left(dư\right)}\) \(\Rightarrow\left\{{}\begin{matrix}m_{Na_2CO_3}=0,15\cdot106=15,9\left(g\right)\\m_{NaOH}=0,15\cdot40=6\left(g\right)\end{matrix}\right.\)
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