Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
![](https://rs.olm.vn/images/avt/0.png?1311)
\(n_K=\dfrac{3,9}{39}=0,1\left(mol\right)\)
PTHH: 2K + Cl2 --to--> 2KCl
0,1 0,05 0,1
\(\rightarrow m_{KCl}=0,1.74,5=7,45\left(g\right)\\ V_{Cl_2}=0,05.22,4=1,12\left(l\right)\\ C\%_{KCl}=\dfrac{7,45}{250}=2,98\%\)
a, \(n_K=\dfrac{3,9}{39}=0,1\left(mol\right)\)
2K + Cl2 ----> 2KCl
0,1 0,05 0,1
\(V_{Cl_2}=0,05.22,4=1,12\left(l\right)\)
b, \(m_{KCl}=0,1.74,5=7,45\left(g\right)\)
\(\Rightarrow C\%_{ddKCl}=\dfrac{7,45.100\%}{250}=2,98\%\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(n_{AgCl}=\dfrac{7,175}{143,5}=0,05\left(mol\right)\)
PTHH: HCl + AgNO3 ---> AgCl↓ + HNO3
0,05<---------------0,05
\(\rightarrow m_{HCl}=0,05.36,5=1,825\left(g\right)\\
\rightarrow C\%_{ddA}=\dfrac{1,825}{50}.100\%=3,65\%\)
\(n_{Cl_2}=\dfrac{6,72}{22,4}=0,3\left(mol\right)\)
Đặt H = x%
PTHH: Cl2 + H2 --as--> 2HCl
LTL: 6,72 < 10 => H2 dư
=> nHCl = 0,3x (mol)
\(\rightarrow C\%_{HCl}=\dfrac{0,3x.36,5}{0,3x.36,5+385,4}.100\%=3,65\%\\ \Leftrightarrow20,23\%\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(n_{O_2}=\dfrac{22,12-21,16}{32}=0,03\left(mol\right)\)
\(n_{KMnO_4}=\dfrac{22,12}{158}=0,14\left(mol\right)\)
Mn+7 + 5e --> Mn+2
0,14-->0,7
2O-2 - 4e --> O20
0,12<--0,03
2Cl- - 2e --> Cl20
2a<---a
Bảo toàn e: 2a + 0,12 = 0,7
=> a = 0,29 (mol)
=> VCl2 = 0,29.22,4 = 6,496 (l)
![](https://rs.olm.vn/images/avt/0.png?1311)
1)
\(n_{H_2}=\dfrac{5,6}{22,4}=0,25\left(mol\right)\Rightarrow n_{HCl}=0,25.2=0,5\left(mol\right)\)
\(V=\dfrac{0,5}{0,5}=1\left(l\right)\)
2)
\(n_{NaCl}=\dfrac{5,85}{58,5}=0,1\left(mol\right)\); \(n_{AgNO_3}=\dfrac{34}{170}=0,2\left(mol\right)\)
PTHH: NaCl + AgNO3 --> NaNO3 + AgCl
Xét tỉ lệ: \(\dfrac{0,1}{1}< \dfrac{0,2}{1}\) => NaCl hết, AgNO3 dư
PTHH: NaCl + AgNO3 --> NaNO3 + AgCl
0,1------------------------>0,1
=> mAgCl = 0,1.143,5 = 14,35 (g)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(n_{KMnO_4}=\dfrac{15,8}{158}=0,1\left(mol\right)\\ 2KMnO_4+16HCl\rightarrow2KCl+2MnCl_2+5Cl_2+8H_2O\\ n_{Cl_2}=\dfrac{5}{2}.0,1=0,25\left(mol\right)\\ V_{Cl_2\left(đkc\right)}=0,25.24,79=6,1975\left(l\right)\)
![](https://rs.olm.vn/images/avt/0.png?1311)
Sơ đồ phản ứng:
KMnO4--(t0) ->{K2MnO4 ,MnO2 ,O2; KMnO4 dư --(HCl)--> KCl; MnCl2,Cl2, H2O.
nKMnO4=25,28/158=0,16 mol ;
Bảo toàn khối lượng---> nO thoát ra = (25,28-23,52)/16=0,11 mol;
Bảo toàn O --> nO còn lại= 0,16*4-0,11=0,53 mol;
--> nH2O = 0,53 mol;
Bảo toàn H --> nHCl = 2nH2O= 2* 0,3 =1,06 (mol);
Bảo toàn K --> nKCl= nKMnO4= 0,16 mol;
Bảo toàn Mn--> nMnCl2=nKMnO4=0,16 mol;
Bảo toàn Cl:
nHCl =nKCl + 2* nMnCl2 + 2*nCl2;
--> nCl2=(1,06 -0,16 -0,16*2 )/2=0,29 mol
--> V =0,29*22,4=6,496(mol)
1/
\(n_{KMnO_4}=\dfrac{15,8}{258}=0,1\left(mol\right)\)
\(2KMnO_4+16HCl\rightarrow2KCl+2MnCl_2+5Cl_2+8H_2O\)
0,1 0,25 (mol)
\(V_{Cl_2}=0,25.22,4=5,6\left(l\right)\)
nKMnO4=\(\dfrac{15,8}{158}\)=0,1mol