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a,\(2KClO_3\rightarrow2KCl+3O_2\)
b, \(n_{KClO_3}=m_{KClO_3}:M_{KClO_3}=73,5:\left(39+35,5+3.16\right)=0,6\left(mol\right)\)
THeo PTHH: \(n_{O_2}=\frac{3}{2}n_{KClO_3}=\frac{3}{2}.0,6=0,9\left(mol\right)\)
\(\Rightarrow V_{O_2}=n_{O_2}.22,4=0,9.22,4=20,16\left(l\right)\)
c, \(2Zn+O_2\rightarrow2ZnO\)
\(n_{Zn}=m_{Zn}:M_{Zn}=13:65=0,2\left(mol\right)\)
Theo PTHH: \(n_{ZnO}=n_{Zn}=0,2\left(mol\right)\)
\(\Rightarrow m_{ZnO}=n_{ZnO}.M_{ZnO}=0,2.\left(65+16\right)=16,2\left(g\right)\)
\(n_{O_2} = \dfrac{0,72}{22,4} = \dfrac{9}{280}(mol)\\ 2KMnO_4 \xrightarrow{t^o} K_2MnO_4 + MnO_2 + O_2\\ n_{KMnO_4} = 2n_{O_2} = \dfrac{9}{140}(mol)\\ m_{KMnO_4} = \dfrac{9}{140}.158 = 10,16(gam)\\ 2KClO_3 \xrightarrow{t^o} 2KCl + 3O_2\\ n_{KClO_3} = \dfrac{2}{3}n_{O_2} = \dfrac{3}{140}(mol)\\ m_{KClO_3} = \dfrac{3}{140}.122,5 = 2,625(gam)\)
\(n_{O_2}=\dfrac{6.72}{22.4}=0.3\left(mol\right)\)
\(2KMnO_4\underrightarrow{t^0}K_2MnO_4+MnO_2+O_2\)
\(0.6..............................................0.3\)
\(2KClO_3\underrightarrow{t^0}2KCl+3O_2\)
\(0.2..........................0.3\)
\(m_{KMnO_4}=0.6\cdot158=94.8\left(g\right)\)
\(m_{KClO_3}=0.2\cdot122.5=24.5\left(g\right)\)
1)
nAl = 0,2 mol
nO2 = 0,1 mol
4Al (2/15) + 3O2 (0,1) ---to----> 2Al2O3 (1/15)
\(\dfrac{nAl}{4}=0,05>\dfrac{nO2}{3}=0,0333\)
=> Chọn nO2 để tính
- Các chất sau phản ứng gồm: \(\left\{{}\begin{matrix}Al_{dư}:0,2-\dfrac{2}{15}=\dfrac{1}{15}\left(mol\right)\\Al_2O_3:\dfrac{1}{15}\left(mol\right)\end{matrix}\right.\)
=> mAldư = 1/15 . 27 = 1,8 gam
=> mAl2O3 = 1/15 . 102 = 6,8 gam
(Câu 2;3;4 tương tự như vậy thôi )
\(n_{CH_4}=\dfrac{2.24}{22.4}=0.1\left(mol\right)\)
\(n_{hh}=\dfrac{3.36}{22.4}=0.15\left(mol\right)\)
\(n_{C_2H_2}=0.15-0.1=0.05\left(mol\right)\)
\(C_2H_2+2Br_2\rightarrow C_2H_2Br_4\)
\(0.05.........0.1\)
\(m_{Br_2}=0.1\cdot160=16\left(g\right)\)
\(n_{O_2}=\frac{6,72}{22,4}=0,3\left(mol\right)\\ PTHH:KClO_3\underrightarrow{t^o}KCl+\frac{3}{2}O_2\\ \left(mol\right)--0,2------0,3--\\ m_{KClO_3}=0,2.122,5=24,5\left(g\right)\)
a) nO2= 6,72/22,4=0,3(mol)
PTHH: 2 KClO3 -to-> 2 KCl + 3 O2
b) nKClO3= 2/3. nO2= 2/3. 0,3=0,2(mol)
=> mKClO3=122,5.0,2= 24,5(g)
3Fe+2O2--->Fe3O4
0,15-0,1------0,05 mol
nFe=8,4\56=0,15 mol
=>VO2=0,15.22,4=3,36 l
=>mFe3O4=0,05.232=11,6 g
Bài 1:
PT: \(3Fe+2O_2\underrightarrow{t^o}Fe_3O_4\)
a, Ta có: \(n_{O_2}=\dfrac{4,48}{22,4}=0,2\left(mol\right)\)
Theo PT: \(n_{Fe}=\dfrac{3}{2}n_{O_2}=0,3\left(mol\right)\)
\(\Rightarrow m_{Fe}=0,3.56=16,8\left(g\right)\)
b, Theo PT: \(n_{Fe_3O_4}=\dfrac{1}{2}n_{O_2}=0,1\left(mol\right)\)
\(\Rightarrow m_{Fe_3O_4}=0,1.232=23,2\left(g\right)\)
Bài 2:
PT: \(2KMnO_4\underrightarrow{t^o}K_2MnO_4+MnO_2+O_2\)
Ta có: \(n_{KMnO_4}=\dfrac{15,8}{158}=0,1\left(mol\right)\)
Theo PT: \(n_{O_2}=\dfrac{1}{2}n_{KMnO_4}=0,05\left(mol\right)\)
\(\Rightarrow V_{O_2}=0,05.22,4=1,12\left(l\right)\)
Bạn tham khảo nhé!
