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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: \(n_{KClO_3\left(TT\right)}=n_{KCl}=0,02\left(mol\right)\)
\(\Rightarrow m_{KClO_3\left(TT\right)}=0,02.122,5=2,45\left(g\right)\)
\(\Rightarrow H=\dfrac{2,45}{3,5}.100\%=70\%\)
\(n_{KClO_3}=\dfrac{7}{122,5}=\dfrac{2}{35}\left(mol\right)\)
PTHH :
\(2KClO_3\underrightarrow{t^o}2KCl+3O_2\)
2/35 2/35 3/35
\(V_{O_2}=\dfrac{3}{35}.24,79\approx2,1249\left(l\right)\)
\(m_{KCl}=\dfrac{2}{35}.74,5\approx4,257\left(g\right)\)
\(H=\dfrac{2,98}{4,257}.100\%=70\%\)
\(n_{KClO3}=\dfrac{5,25}{122,5}=\dfrac{3}{70}\left(mol\right)\)
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) \(m_{KCl\left(lt\right)}=\dfrac{3}{70}.74,5=\dfrac{447}{140}\left(mol\right)\)
\(\Rightarrow H\%=\dfrac{m_{tt}}{m_{lt}}.100\%=\dfrac{2,235}{\dfrac{447}{140}}.100\%=70\%\)
\(a.2KClO_3-^{t^o}\rightarrow2KCl+3O_2\\ n_{O_2}=\dfrac{3}{2}n_{KClO_3}=0,6\left(mol\right)\\ \Rightarrow V_{O_2}=0,6.22,4=13,44\left(l\right)\\ n_{KCl}=n_{KClO_3}=0,4\left(mol\right)\\ \Rightarrow m_{KCl}=0,4.74,5=29,8\left(g\right)\)
a, \(2KClO_3\underrightarrow{t^o}2KCl+3O_2\)
b, \(n_{KCl}=\dfrac{0,745}{74,5}=0,01\left(mol\right)\)
Theo PT: \(n_{O_2}=\dfrac{3}{2}n_{KCl}=0,015\left(mol\right)\)
\(\Rightarrow V_{O_2}=0,015.24,79=0,37185\left(l\right)\)
\(m_{O_2}=0,015.32=0,48\left(g\right)\)
c, \(n_{KClO_3\left(pư\right)}=n_{KCl}=0,01\left(mol\right)\)
\(\Rightarrow m_{KClO_3\left(pư\right)}=0,01.122,5=1,225\left(g\right)\)
\(\Rightarrow H=\dfrac{1,225}{2,5}.100\%=49\%\)
