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\(n_{KClO_3}=\dfrac{7}{122,5}=\dfrac{2}{35}\left(mol\right)\)
PTHH :
\(2KClO_3\underrightarrow{t^o}2KCl+3O_2\)
2/35 2/35 3/35
\(V_{O_2}=\dfrac{3}{35}.24,79\approx2,1249\left(l\right)\)
\(m_{KCl}=\dfrac{2}{35}.74,5\approx4,257\left(g\right)\)
\(H=\dfrac{2,98}{4,257}.100\%=70\%\)
\(a.2KClO_3-^{t^o}\rightarrow2KCl+3O_2\\ n_{O_2}=\dfrac{3}{2}n_{KClO_3}=0,6\left(mol\right)\\ \Rightarrow V_{O_2}=0,6.22,4=13,44\left(l\right)\\ n_{KCl}=n_{KClO_3}=0,4\left(mol\right)\\ \Rightarrow m_{KCl}=0,4.74,5=29,8\left(g\right)\)
\(n_{KClO3}=\dfrac{5,25}{122,5}=\dfrac{3}{70}\left(mol\right)\)
a) PTHH : \(2KClO_3\xrightarrow[]{t^o}2KCl+3O_2\)
\(\dfrac{3}{70}\) \(\dfrac{3}{70}\) \(\dfrac{9}{140}\)
b) \(V_{O2\left(dktc\right)}=\dfrac{9}{140}.22,4=1,44\left(l\right)\)
c) \(m_{KCl\left(lt\right)}=\dfrac{3}{70}.74,5=\dfrac{447}{140}\left(mol\right)\)
\(\Rightarrow H\%=\dfrac{m_{tt}}{m_{lt}}.100\%=\dfrac{2,235}{\dfrac{447}{140}}.100\%=70\%\)
\(n_{KClO_3}=\dfrac{24,5}{122,5}=0,2mol\)
\(\Rightarrow n_{KCl}=0,2mol\)
\(\Rightarrow m_{KCl}=0,2.74,5=14,9g\)
+) \(n_{O_2}=0,2.3:2=0,3mol\)
=> \(V_{O_2}=0,3.22,4=6,72l\)
nKClO3 = 49/122,5 = 0,4 (mol)
PTHH: 2KClO3 -> (t°, MnO2) 2KCl + 3O2
nO2 (TT) = 0,6 . 90% = 0,54 (mol)
VO2 = 0,54 . 22,4 = 12,096 (l)
a) 2KClO3------> 2KCl+ 3O2
công thức tính khối lượng:
m KClo3= m KCl+ m O2
b) m KCLo3= 14,9+9,6=24,5g
PTHH: \(2Mg+O_2\underrightarrow{t^o}2MgO\)
Gộp cả phần a và b
Ta có: \(n_{Mg}=\dfrac{12}{24}=0,5\left(mol\right)\)
\(\Rightarrow\left\{{}\begin{matrix}n_{O_2}=0,25mol\\n_{MgO}=0,5mol\end{matrix}\right.\) \(\Rightarrow\left\{{}\begin{matrix}m_{O_2}=0,25\cdot22,4=5,6\left(l\right)\\m_{MgO}=0,5\cdot40=20\left(g\right)\end{matrix}\right.\)
\(n_{KClO_3\left(bd\right)}=\dfrac{55,125}{122,5}=0,45\left(mol\right)\)
=> \(n_{KClO_3\left(pư\right)}=\dfrac{0,45.85}{100}=0,3825\left(mol\right)\)
PTHH: 2KClO3 --to,MnO2--> 2KCl + 3O2
0,3825------------------->0,57375
=> \(V_{O_2}=0,57375.22,4=12,852\left(l\right)\)
a, PT: \(2KClO_3\underrightarrow{t^o}2KCl+3O_2\)
Ta có: \(n_{KCl}=\dfrac{1,49}{74,5}=0,02\left(mol\right)\)
Theo PT: \(n_{O_2}=\dfrac{3}{2}n_{KCl}=0,03\left(mol\right)\)
\(\Rightarrow V_{O_2}=0,03.24,79=0,7437\left(l\right)\)
b, Theo PT: \(n_{KClO_3\left(TT\right)}=n_{KCl}=0,02\left(mol\right)\)
\(\Rightarrow m_{KClO_3\left(TT\right)}=0,02.122,5=2,45\left(g\right)\)
\(\Rightarrow H=\dfrac{2,45}{3,5}.100\%=70\%\)
2KClO3=>2KCl+3O2
a, nKCl=1,49/74,5=0,02(mol)
=>nO2=0,03(mol)
=>V O2=0,03.22,4=0,672(l)
b, nKClO3=0,02(mol)
mKClO3=0,02.122,5=2,45(g)
H(KClO3)=2,45/3,5.100%=70%