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\(2KClO_3 \xrightarrow{t^o} 2KCl + 3O_2\)
a)
\(n_{O_2} = \dfrac{48}{32} = 1,5(mol)\)
Theo PTHH :
\(n_{KClO_3} = \dfrac{2}{3}n_{O_2} = 1(mol)\\ \Rightarrow m_{KClO_3} = 1.122,5 = 122,5(gam)\)
b)
\(n_{O_2} = \dfrac{44,8}{22,4} = 2(mol) \)
Theo PTHH :
\(n_{KClO_3} = \dfrac{2}{3}n_{O_2} = \dfrac{4}{3}mol\\ \Rightarrow m_{KClO_3} = \dfrac{4}{3}.122.5 = 163,33(gam)\)
a) PTHH: 2KClO3-->2KCl + 3O2 1mol <---1mol<---1,5mol nO2=48/32=1,5mol=> nKClO3=1 =>mKClO3=1.122,5=122,5 gamvậy cần 122,5 gam KClO3 để điều chế 48 gam khí oxi
b)PTHH: 2KClO3-->2KCl + 3O2 4/3mol <---4/3mol<---2mol nO2=44,8/22,4=2mol=> nKClO3=4/3mol =>mKClO3=4/3.122,5=163,33333gamVậy cần 163,33333gam KClO3 để điều chế 44,8 lít khí oxi ở đktc
$2KClO_3 \xrightarrow{t^o} 2KCl +3 O_2$
a) n O2 = 48/32 = 1,5(mol)
n KClO3 = 2/3 n O2 = 1(mol)
m KClO3 = 1.122,5 = 122,5(gam)
b) n O2 = 44,8/22,4 = 2(mol)
n KClO3 = 2/3 n O2 = 4/3 (mol)
m KClO3 = 122,5.4/3 = 163,33(gam)
\(a.\)
\(n_{O_2}=\dfrac{48}{32}=1.5\left(mol\right)\)
\(2KClO_3\underrightarrow{^{t^0}}2KCl+3O_2\)
\(1...............................1.5\)
\(m_{KClO_3}=1\cdot122.5=122.5\left(g\right)\)
\(b.\)
\(n_{O_2}=\dfrac{44.8}{22.4}=2\left(mol\right)\)
\(2KClO_3\underrightarrow{^{t^0}}2KCl+3O_2\)
\(\dfrac{4}{3}.................2\)
\(m_{KClO_3}=\dfrac{4}{3}\cdot122.5=163.3\left(g\right)\)
a/ Ta co PTHH: \(2KClO_3\) -->2KCl+3\(O_2\)
\(n_{O_2}\)= 48: 32= 1,5 mol
Theo PTHH ta co:
Cu 3 mol \(O_2\) phan ung voi 2 mol \(KClO_3\)
Cu 1,5 mol \(O_2\)phan ung voi 1 mol \(KClO_3\)
\(m_{KClO_3}\)= n.M= 1. 122,5= 122,5 (g)
b/ \(n_{O_2}\)= 44,8: 22,4= 2 (mol)
Theo PTHH ta co:
Cu 3 mol \(O_2\) phan ung voi 2 mol \(KClO_3\)
Cu 2 mol \(O_2\) phan ung voi 1,3 mol \(KClO_3\)
\(m_{KClO_3}\)= n.M= 1,3 . 122.5= 159.25 (g)
\(B1\\ n_{O_2}=\dfrac{11,2}{22,4}=0,5\left(mol\right)\\ 2KClO_3\rightarrow\left(t^o\right)2KCl+3O_2\\ n_{KClO_3}=\dfrac{2}{3}.0,5=\dfrac{1}{3}\left(mol\right)\\ m_{KClO_3}=122,5.\dfrac{1}{3}=\dfrac{245}{6}\left(g\right)\\ B2:n_{O_2}=\dfrac{16}{32}=0,5\left(mol\right)=n_{O_2\left(bài1\right)}\\ \Rightarrow n_{KClO_3}=\dfrac{1}{3}\left(mol\right)\\ m_{KClO_3}=\dfrac{245}{6}\left(g\right)\)
Câu 6.
\(n_{O_2}=\dfrac{16,8}{22,4}=0,75mol\)
\(2KMnO_4\underrightarrow{t^o}K_2MnO_4+MnO_2+O_2\)
1,5 0,75
\(m_{KMnO_4}=1,5\cdot158=237g\)
Câu 7.
\(n_{Fe_3O_4}=\dfrac{4,64}{232}=0,02mol\)
\(3Fe+2O_2\underrightarrow{t^o}Fe_3O_4\)
0,04 0,02
\(2KClO_3\underrightarrow{t^o}2KCl+3O_2\)
\(\dfrac{2}{75}\) 0,04
\(m_{KClO_3}=\dfrac{2}{75}\cdot122,5=\dfrac{49}{15}\approx3,27g\)
1) nO2= 48/32=1,5(mol)
PTHH: 2 KMnO4 -to-> K2MnO4 + MnO2 + O2
nKMnO4=2.1,5=3(mol)
=>mKMnO4=158.3= 474(g)
2) nO2=2,24/22,4=0,1(mol)
nKMnO4=2.0,1=0,2(mol)
-> mKMnO4=158.0,2= 31,6(g)