m(g) MnO2 tác dụng d2 HCl dư 6,72l Cl2 đktc . Xác định V Cl2
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200ml = 0,2l
\(n_{HCl}=2.0,2=0,4\left(mol\right)\)
Pt : \(MnO_2+4HCl_{đặc}\underrightarrow{t^o}MnCl_2+Cl_2+2H_2O|\)
1 4 1 1 2
0,4 0,1
\(n_{Cl2}=\dfrac{0,4.1}{4}=0,1\left(mol\right)\)
\(V_{Cl2\left(dktc\right)}=0,1.22,4=2,24\left(l\right)\)
Chúc bạn học tốt
\(n_{MnO_2}=\dfrac{17,4}{87}=0,2\left(mol\right)\)
PTHH: MnO2 + 4HCl --> MnCl2 + Cl2 + 2H2O
______0,2------------------------->0,2
=> VCl2 = 0,2.22,4 = 4,48(l)
- PT: a, \(2KMnO_4+16HCl\rightarrow2KCl+2MnCl_2+5Cl_2+8H_2O\) (1)
\(MnO_2+4HCl_đ\underrightarrow{t^o}MnCl_2+Cl_2+2H_2O\) (2)
- Ta có: \(n_{HCl\left(1\right)}=n_{HCl\left(2\right)}=0,2.2=0,4\left(mol\right)\)
Theo PT (1): \(n_{Cl_2}=\dfrac{5}{16}n_{HCl\left(1\right)}=0,125\left(mol\right)\Rightarrow V_1=0,125.22,4=2,8\left(l\right)\)
(2): \(n_{Cl_2\left(2\right)}=\dfrac{1}{4}n_{HCl\left(2\right)}=0,1\left(mol\right)\Rightarrow V_2=0,1.22,4=2,24\left(l\right)\)
PTHH: MnO2 + 4HCl --> MnCl2 + Cl2 + 2H2O
0,25----->1---------------->0,25
\(V_{ddHCl}=\dfrac{1}{2}=0,5\left(l\right)=500\left(ml\right)\)
\(V_{Cl_2}=0,25.22,4=5,6\left(l\right)\)
a) Gọi số mol Mg, Al, Fe trong m gam hỗn hợp là a, b, c (mol)
\(n_{H_2}=\dfrac{7,84}{22,4}=0,35\left(mol\right)\)
PTHH: \(Mg+2HCl\rightarrow MgCl_2+H_2\uparrow\)
_______a--------------------->a------->a_______(mol)
\(2Al+6HCl\rightarrow2AlCl_3+3H_2\uparrow\)
_b-------------------->b------->1,5b___________(mol)
\(Fe+2HCl\rightarrow FeCl_2+H_2\uparrow\)
_c------------------>c------->c_______________(mol)
=> \(\left\{{}\begin{matrix}a+1,5b+c=0,35\left(1\right)\\95a+133,5b+127c=35,55\left(2\right)\end{matrix}\right.\)
Mặt khác:
PTHH: \(Mg+Cl_2\underrightarrow{t^o}MgCl_2\)
_______a--------------->a_________(mol)
\(2Al+3Cl_2\underrightarrow{t^o}2AlCl_3\)
_b----------------->b______________(mol)
\(2Fe+3Cl_2\underrightarrow{t^o}2FeCl_3\)
_c------------------>c______________(mol)
=> 95a + 133,5b + 162,5 = 39,1 (3)
(1)(2)(3) => \(\left\{{}\begin{matrix}a=0,1\left(mol\right)\\b=0,1\left(mol\right)\\c=0,1\left(mol\right)\end{matrix}\right.\)
=> m = 24.0,1 + 27.01 + 56.0,1 = 10,7(g)
b) \(\left\{{}\begin{matrix}m_{Mg}=24.0,1=2,4\left(g\right)\\m_{Al}=27.0,1=2,7\left(g\right)\\m_{Fe}=56.0,1=5,6\left(g\right)\end{matrix}\right.\)
Đáp án C
MnO2 + 4HCl →MnCl2 + 2H2O + Cl2
0,1 →0,1 (mol)
Do H% = 85% => = 0,085 (mol)
V = 0,085.22,4 = 1,904 (lít)
\(A.2A+3Cl_2\rightarrow2ACl_3\\ n_A:2=n_{ACl_3}:2\\ \Leftrightarrow\dfrac{10,8}{A}:2=\dfrac{53,4}{A+106,5}:2\\ \Leftrightarrow A=27,Al\\ n_{Cl_2}=1,5n_{Al}=1,5\cdot\dfrac{10,8}{27}=0,6mol\\ V_{Cl_2}=0,6.22,4=13,44l\)
\(n_{Cl_2}=\dfrac{6,72}{22,4}=0,3\left(mol\right)\\ PTHH:MnO_2+4HCl\rightarrow MnCl_2+2H_2O+2Cl_2\)
\(n_{MnO_2}=\dfrac{1}{2}n_{HCl}=\dfrac{1}{2}.0,3=0,15\left(mol\right)\\ \rightarrow m_{MnO_2}=0,15.87=13,05\left(g\right)\)