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![](https://rs.olm.vn/images/avt/0.png?1311)
\(M_2CO_3+2HCl\rightarrow2MCl+H_2O+CO_2\)
a---------->2a--------------------------->a
\(MHCO_3+HCl\rightarrow MCl+H_2O+CO_2\)
b---------->b---------------------------->b
\(NaOH+HCl\rightarrow NaCl+H_2O\)
0,1----->0,1
\(\left\{{}\begin{matrix}a+b=n_{CO_2}=0,3\\2a+b+0,1=0,5\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}a=0,1\\b=0,2\end{matrix}\right.\)
=> \(0,1\left(2M+60\right)+0,2\left(M+61\right)=27,4\Rightarrow M=23\)
M là Na
Hai muối ban đầu là \(Na_2CO_3,NaHCO_3\)
\(m_{Na_2CO_3}=0,1.106=10,6\left(g\right)\)
\(m_{NaHCO_3}=0,2.84=16,8\left(g\right)\)
b. Trong đề không có đề cập tới V bạn.
![](https://rs.olm.vn/images/avt/0.png?1311)
nHCl (ban đầu) = 0.6(mol)
gọi nK2CO3 = x (mol)
nNa2CO3 = y(mol)
Ta có : x + y = nCO2 = 0.25(mol)
K2CO3 + 2HCl ---> 2KCl + H2O + CO2
x________2x____________________x
Na2CO3 + 2HCl ---> 2NaCl + H2O + CO2
y_________2y____________________y
=> n(HCl pư) = 2 x 0.25 = 0.5(mol)
=> nHCl dư = 0.1(mol) = nNaOH
=> dd thu được gồm : K(+) , Na(+), Cl(-) , Na(+)
Ta có : 78x + 46y = 39.9 - 0.6*35.5 - 23*0.1 = 16.3
=> x = 0.15
y = 0.1
BẠN THAM KHẢO
![](https://rs.olm.vn/images/avt/0.png?1311)
Đặt \(\left\{{}\begin{matrix}n_{Al}=x\\n_{Zn}=y\\n_{Cu}=z\end{matrix}\right.\) ( mol )
\(m_{hh}=27x+65y+64z=22,8\left(g\right)\) (1)
\(2Al+6HCl\rightarrow2AlCl_3+3H_2\uparrow\)
x 1,5x ( mol )
\(Zn+2HCl\rightarrow ZnCl_2+H_2\uparrow\)
y y ( mol )
\(n_{H_2}=1,5x+y=\dfrac{11,2}{22,4}=0,5\left(mol\right)\) (2)
B là Cu
\(2Cu+O_2\rightarrow\left(t^o\right)2CuO\)
z z ( mol )
\(n_{CuO}=z=\dfrac{5,5}{80}=0,06875\left(mol\right)\) (3)
\(\left(1\right);\left(2\right);\left(3\right)\Rightarrow\left\{{}\begin{matrix}x=0,2\\y=0,2\\z=0,06875\end{matrix}\right.\)
\(\left\{{}\begin{matrix}m_{Al}=0,2.27=5,4\left(g\right)\\m_{Zn}=0,2.65=13\left(g\right)\\m_{Cu}=22,8-5,4-13=4,4\left(g\right)\end{matrix}\right.\)
![](https://rs.olm.vn/images/avt/0.png?1311)
Ta có: \(n_{CaCO_3}=\dfrac{2}{100}=0,02\left(mol\right)\)
\(a.PTHH:CaCO_3+2HCl--->CaCl_2+CO_2\uparrow+H_2O\)
b. Theo PT: \(n_{CO_2}=n_{CaCO_3}=0,02\left(mol\right)\)
\(\Rightarrow V_{CO_2}=0,02.22,4=0,448\left(lít\right)\)
c. Theo PT: \(n_{HCl}=2.n_{CaCO_3}=2.0,02=0,04\left(mol\right)\)
\(\Rightarrow m_{HCl}=0,04.36,5=1,46\left(g\right)\)
\(a,PTHH:CaCO_3+2HCl\rightarrow CaCl_2+CO_2+H_2O\)
\(b,n_{CaCO_3}=\dfrac{m}{M}=\dfrac{2}{100}=0,02\left(mol\right)\\ Theo.PTHH:n_{CO_2}=n_{CaCO_3}=0,02\left(mol\right)\\ V_{CO_2\left(đktc\right)}=n.22,4=0,02.22,4=0,448\left(l\right)\)
\(b,Theo.PTHH:n_{HCl}=2.n_{CaCO_3}=2.0,02=0,04\left(mol\right)\\ m_{HCl}=n.M=0,04.36,5=1,46\left(g\right)\)