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\(n_{O_2}=\dfrac{9.6}{32}=0.3\left(mol\right)\)
\(2KClO_3\underrightarrow{^{^{t^0}}}2KCl+3O_2\)
\(a.\)
\(n_{KClO_3}=n_{KCl}=\dfrac{2}{3}\cdot n_{O_2}=\dfrac{2}{3}\cdot0.3=0.2\left(mol\right)\)
\(m_{KClO_3}=0.2\cdot122.5=24.5\left(g\right)\)
\(b.\)
\(m_{KCl}=0.2\cdot74.5=14.9\left(g\right)\)
\(a,n_{O_2}=\dfrac{9,6}{32}=0,3(mol)\\ 2KClO_3\xrightarrow[MnO_2]{t^o}2KCl+3O_2\\ \Rightarrow n_{KClO_3}=\dfrac{2}{3}n_{O_2}=0,2(mol)\\ \Rightarrow m_{KClO_3}=0,2.122,5=24,5(g)\\ b,n_{KCl}=n_{KClO_3}=0,2(mol)\\ \Rightarrow m_{KCl}=0,2.74,5=14,9(g)\)
\(a.2KClO_3-^{t^o}\rightarrow2KCl+3O_2\\ n_{O_2}=\dfrac{3}{2}n_{KClO_3}=0,6\left(mol\right)\\ \Rightarrow V_{O_2}=0,6.22,4=13,44\left(l\right)\\ n_{KCl}=n_{KClO_3}=0,4\left(mol\right)\\ \Rightarrow m_{KCl}=0,4.74,5=29,8\left(g\right)\)
\(Coi\ n_{O_2} = 3(mol)\\ 2KMnO_4 \xrightarrow K_2MnO_4 + MnO_2+ O_2\\ n_{KMnO_4} = 2n_{O_2} = 6(mol)\\ 2KClO_3 \xrightarrow{t^o} 2KCl + 3O_2\\ n_{KClO_3} = \dfrac{2}{3}n_{O_2} = 2(mol)\\ \dfrac{m_{KMnO_4}}{m_{KClO_3}} = \dfrac{6.158}{2.122,5} = 3,869\)
\(2KMnO_4\underrightarrow{^{t^0}}K_2MnO_4+MnO_2+O_2\)
\(2a................................a\)
\(2KClO_3\underrightarrow{^{t^0}}2KCl+3O_2\)
\(\dfrac{2a}{3}..................a\)
\(m_{KMnO_4}=2a\cdot158=316a\left(g\right)\)
\(m_{KClO_3}=\dfrac{2}{3}a\cdot122.5=\dfrac{245a}{3}\left(g\right)\)
\(\dfrac{m_{KMnO_4}}{m_{KClO_3}}=\dfrac{316a}{\dfrac{245a}{3}}=\dfrac{948}{245}\)
-Gọi số mol của oxygen là a (mol) \(\left(a>0\right)\)
-PTHH (1): \(2KMnO_4\rightarrow^{t^0}K_2MnO_4+MnO_2+O_2\)
2a a (mol)
\(\Rightarrow m_{KMnO_4}=n.M=2a.158=316a\left(g\right)\)
-PTHH (2): \(2KClO_3\rightarrow^{t^0}2KCl+3O_2\)
\(\dfrac{2}{3}a\) a (mol)
\(\Rightarrow m_{KClO_3}=n.M=\dfrac{2}{3}a.122,5\approx81,67.a\left(g\right)\)
\(\dfrac{m_{KMnO_4}}{m_{KClO_3}}=\dfrac{316.a}{81,67.a}\approx3,87\)
a) PTHH: 2 KClO3 -to-> 2 KCl + 3 O2
nKCl= 14,9/74,5= 0,2(mol)
b) nKClO3=nKCl=0,2(mol)
=>mKClO3=0,2.122,5=24,5(g)
c) nO2=3/2. 0,2=0,3(mol)
=>V(O2,đktc)=0,3.22,4=6,72(l)
PT: \(2KClO_3\underrightarrow{t^o}2KCl+3O_2\)
\(4Al+3O_2\underrightarrow{t^o}2Al_2O_3\)
Ta có: \(n_{Al_2O_3}=\dfrac{15,3}{102}=0,15\left(mol\right)\)
Theo PT: \(n_{KClO_3}=\dfrac{2}{3}n_{O_2}=\dfrac{2}{3}.\dfrac{3}{2}n_{Al_2O_3}=0,15\left(mol\right)\)
\(\Rightarrow m_{KClO_3}=0,15.122,5=18,375\left(g\right)\)
a, Ta có: \(n_{Fe_3O_4}=\dfrac{4,64}{232}=0,02\left(mol\right)\)
PT: \(3Fe+2O_2\underrightarrow{t^o}Fe_3O_4\)
THeo PT: \(n_{O_2}=2n_{Fe_3O_4}=0,04\left(mol\right)\Rightarrow V_{O_2}=0,04.22,4=0,896\left(l\right)\)
b, PT: \(2KMnO_4\underrightarrow{t^o}K_2MnO_4+MnO_2+O_2\)
\(n_{KMnO_4}=2n_{O_2}=0,08\left(mol\right)\Rightarrow m_{KMnO_4}=0,08.158=12,64\left(g\right)\)
a) \(n_{Fe_3O_4}=\dfrac{m_{Fe_3O_4}}{M_{Fe_3O_4}}=\dfrac{4,64}{232}=0,02\left(mol\right)\).
PTHH : \(3Fe+2O_2\underrightarrow{t^o}Fe_3O_4\)
Mol : 3 : 2 : 1
Mol 0,04 ← 0,02
\(\Rightarrow V_{O_2}=n_{O_2}.22,4=\left(0,04\right).\left(22,4\right)=0,896\left(l\right)\).
b) Từ phương trình ở câu a \(\Rightarrow n_{O_2}=0,04\left(mol\right)\).
PTHH : \(2KMnO_4\underrightarrow{t^o}K_2MnO_4+MnO_2+O_2\)
Mol : 2 : 1 : 1 : 1
Mol : 0,08 ← 0,04
\(\Rightarrow m_{KMnO_4}=n_{KMnO_4}.M_{KMnO_4}=\left(0,08\right).158=12,64\left(g\right)\).
2KClO3 -> 2KCl + 3O2
a.nO2 = 0.28125mol
=> nKClO3 = 0.1875mol
=> mKClO3 = 22.97g
b.nKCl = nKClO3 = 0.1875mol
=> mKCl = 13.97g
$a)PTHH:2KClO_3\xrightarrow{t^o}2KCl+3O_2$
$n_{O_2}=\dfrac{9}{32}=0,28125(mol)$
$\Rightarrow n_{KClO_3}=\dfrac{2}{3}n_{O_2}=0,1875(mol)$
$\Rightarrow m_{KClO_3}=0,1875.122,5=22,96875(g)$
$b)$ Theo PT: $n_{KCl}=n_{KClO_3}=0,1875(mol)$
$\Rightarrow m_{KCl}=0,1875.74,5=13,96875(g)$