\(2KClO_3\rightarrow3O_2+2KCl\)

\(m_{KClO_3}=m_{O_2}+m_{KCl}\)

\(\Rightarrow m_{KCl}=m_{KClO_3}-m_{KCl}=24,5-9,6=14,9\left(g\right)\)

2KClO₃-to\xt->2KCl+3O₂

0,1------------------0,1

n KClO3=\(\dfrac{12,25}{122,5}\)=0,1 mol

=>m KCl=0,1.74,5=7,45g

H=\(\dfrac{6,8}{7,45}.100\)=91,275%

b)

2KClO₃-to\xt->2KCl+3O₂

0,2-------------------------0,3 mol

n O2=\(\dfrac{6,72}{22,4}\)=0,3 mol

H=85%

=>m KClO3=0,2.122,5.\(\dfrac{100}{85}\)=28,82g

c)

2KClO₃-to\xt->2KCl+3O₂

0,2------------------------0,3

n KClO3=\(\dfrac{24,5}{122,5}\)=0,2 mol

H=80%

=>m O2=0,3.32.\(\dfrac{80}{100}\)=10,4g

a) \(2KClO_3 \xrightarrow{t^o} 2KCl + 3O_2\)

b)

\(n_{KClO_3} = \dfrac{36,75}{122,5} = 0,3(mol)\)

Theo PTHH : 

\(n_{KCl} = n_{KClO_3} = 0,3(mol)\\ \Rightarrow m_{KCl} = 0,3.74,5 = 22,35(gam)\\ \Rightarrow m_{O_2} = m_{KClO_3} - m_{KCl} = 14,4(gam)\)

c)

Bảo toàn khối lượng : 

\(m_{O_2} = 25 - 15,4 = 9,6(gam)\\ \Rightarrow n_{O_2} = \dfrac{9,6}{32} = 0,3(mol)\\ n_{KClO_3} = \dfrac{2}{3}n_{O_2} = 0,2(mol)\\ \Rightarrow m_{KClO_3} = 0,2.122,5 = 24,5(gam)\\ \%m_{tạp\ chất}= \dfrac{25-24,5}{25}.100\% = 2\%\)

\(a.\)

\(2KClO_3\underrightarrow{t^0}2KCl+3O_2\)

\(b.\)

\(n_{KClO_3}=\dfrac{36.75}{122.5}=0.3\left(mol\right)\)

\(\Rightarrow n_{O_2}=\dfrac{3}{2}n_{KClO_3}=\dfrac{3}{2}\cdot0.3=0.45\left(mol\right)\)

\(m_{O_2}=0.45\cdot32=14.4\left(g\right)\)

\(m_{KCl}=0.3\cdot74.5=22.35\left(g\right)\)

\(c.\)

\(2KClO_3\underrightarrow{t^0}2KCl+3O_2\)

\(a.............a\)

\(m_{Cr}=m_{KCl}+m_{tc}=25-122.5a+74.5a=15.4\left(g\right)\)

\(\Rightarrow a=0.2\)

\(m_{O_2}=\dfrac{3}{2}\cdot0.2\cdot32=9.6\left(g\right)\)

\(m_{KClO_3}=0.2\cdot122.5=24.5\left(g\right)\)

\(m_{tc}=25-24.5=0.5\left(g\right)\)

\(\%m_{Tc}=\dfrac{0.5}{25}\cdot100\%-2\%\)

2KClO₃-to>2KCl+3O₂

0,3---------------------0,45 mol

n_KClO3= \(\dfrac{36,75}{122,5}\)=0,3 mol

=>V_O2=0,45.22,4=10,08l

=>D

\(n_{KClO_3}=\dfrac{36,75}{122,5}=0,3\left(mol\right)\\ 2KClO_3\rightarrow\left(t^o,xt\right)2KCl+3O_2\\ n_{O_2}=\dfrac{3}{2}.0,3=0,45\left(mol\right)\\ \Rightarrow V_{O_2\left(đktc\right)}=0,45.22,4=10,08\left(l\right)\\ \Rightarrow ChọnD\)

Xíu check in sân bay, chừ làm vài câu đã háy :P

\(n_{KClO_3\left(bd\right)}=\dfrac{55,125}{122,5}=0,45\left(mol\right)\)

=> \(n_{KClO_3\left(pư\right)}=\dfrac{0,45.85}{100}=0,3825\left(mol\right)\)

PTHH: 2KClO₃ --t^o,MnO₂--> 2KCl + 3O₂

             0,3825------------------->0,57375

=> \(V_{O_2}=0,57375.22,4=12,852\left(l\right)\)

2KClO₃-to>2KCl+3O₂

0,45---------------------0,675 mol

n _KClO3=\(\dfrac{55,125}{122,5}\)=0,45 mol

=>H=85%

=>V_O2=0,675.22,4.\(\dfrac{85}{100}\)=12,852l

a) $2KClO_3 \xrightarrow{t^o} 2KCl + 3O_2$

$n_{KClO_3} = \dfrac{36,75}{122,5} = 0,3(mol)$

Theo PTHH : $n_{O_2} = \dfrac{3}{2}n_{KClO_3} = 0,45(mol)$

$\Rightarrow V_{O_2} = 0,45.22,4 = 10,08(lít)$

b) Số phân tử $KCl = 0,45.6.10^{23} = 2,7.10^{23}$ phân tử

c) $2Mg + O_2 \xrightarrow{t^o} 2MgO$

Theo PTHH : $n_{MgO} = 2n_{O_2} = 0,9(mol)$
$m_{MgO} = 0,9.40 = 36(gam)$

\(n_{KClO_3}=\dfrac{12,25}{122,5}=0,1mol\)

\(2KClO_3\rightarrow\left(t^o,MnO_2\right)2KCl+3O_2\)

    0,1                                   0,1     0,15   ( mol )

\(m_{KCl}=0,1.74,5=7,45g\)

\(V_{O_2}=0,15.22,4=3,36l\)

2KClO3-to>2KCl+3O2

0,1------------0,1-----0,15

n KClO3=\(\dfrac{12,25}{122,5}=0,1mol\)

=>m KCL=0,1.74,5=7,45g

=>VO2=0,15.22,4=3,36l

Sửa đề: \(KClO_3\)
a) \(PTHH:2KClO_3\rightarrow2KCl+3O_2\)

b) Tỉ lệ: \(2:2:3\)

c) Theo định luật \(BTKL\) , ta có:

\(m_{KClO_3}=m_{KCl}+m_{O_2}\)

\(m_{KClO_3}=14,9+9,6\)

\(\Rightarrow m_{KClO_3}=24,5\left(g\right)\)