\(a.2KClO_3-^{t^o}\rightarrow2KCl+3O_2\\ n_{O_2}=\dfrac{3}{2}n_{KClO_3}=0,6\left(mol\right)\\ \Rightarrow V_{O_2}=0,6.22,4=13,44\left(l\right)\\ n_{KCl}=n_{KClO_3}=0,4\left(mol\right)\\ \Rightarrow m_{KCl}=0,4.74,5=29,8\left(g\right)\)

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: $n_{KCl}=n_{KClO_3}=0,1875(mol)$

$\Rightarrow m_{KCl}=0,1875.74,5=13,96875(g)$

nKClO3 = 24.5/122.5 = 0.2 (mol) 

2KClO3 -to-> 2KCl + 3O2 

0.2_________0.2____0.3 

mKCl = 0.2*74.5 = 14.9 (g) 

VO2 = 0.3*22.4 = 6.72 (l) 

nO2 = 33.6/22.4= 1.5 (mol) 

=> nKClO3 = 2/3 * nO2 = 2/3 * 1.5 = 1  (mol) 

mKClO3 = 122.5 (g) 

\(n_{KClO_3}=\dfrac{24.5}{122.5}=0.2\left(mol\right)\)

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

\(0.2.............0.2.........0.3\)

\(m_{KCl}=0.2\cdot74.5=14.9\left(g\right)\)

\(V_{O_2}=0.3\cdot22.4=6.72\left(l\right)\)

\(n_{_{ }O_2}=\dfrac{33.6}{22.4}=1.5\left(mol\right)\)

\(\Rightarrow n_{KClO_3}=1.5\cdot\dfrac{2}{3}=1\left(mol\right)\)

\(m_{KClO_3}=122.5\left(g\right)\)

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

b) \(n_{KCl} = n_{KClO_3} = \dfrac{24,5}{122,5} = 0,2(mol)\\ \Rightarrow m_{KCl} = 0,2.74,5 = 14,9(gam)\)

c)

\(n_{O_2} = \dfrac{3}{2}n_{KClO_3} = 0,3(mol)\\ \Rightarrow V_{O_2} = 0,3.22,4 = 6,72(lít)\)

d)

\(n_{KClO_3} = \dfrac{2}{3}n_{O_2} = \dfrac{2}{3}.\dfrac{33,6}{22,4} = 1(mol)\\ \Rightarrow m_{KClO_3} = 1.122,5 = 122,5(gam)\)

2KClO₃ --t^o--> 2KCl + 3O₂

Tỉ lệ: 2:2:3

=> A

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)

\(a) 2KClO_3 \xrightarrow{t^o} 2KCl + 3O_2\\ b) n_{KClO_3} = n_{KCl} = \dfrac{14,9}{74,5} = 0,2(mol)\\ \Rightarrow m_{KClO_3} = 0,2.122,5 = 24,5(gam)\\ c)\ n_{O_2} = \dfrac{3}{2}n_{KCl} = 0,3(mol)\\ V_{O_2} = 0,3.22,4 = 6,72(lít)\)

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)

a/ PTHH: 2KClO₃ =(nhiệt)=> 2KCl + 3O₂

n_O2 = 9,6 / 32 = 0,3 mol

=> n_KClO3 = 0,2 (mol)

=> m_KClO3 = 0,2 x 122,5 = 24,5 gam

b/ Cách 1:

n_KCl = n_KClO3 = 0,2 mol

=> m_KCl = 0,2 x 74,5 = 14,9 gam

Cách 2:

Áp dụng định luật bảo toàn khối lượng

=> m_KCl = m_KClO3 - m_O2 = 24,5 - 9,6 = 14,9 gam

Ta có : \(n_{O_2} = \dfrac{9,6}{32} = 0,3(mol) \)

Phương trình hóa học :

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

Theo PTHH :

\(n_{KClO_3} = n_{KCl} = \dfrac{2}{3}n_{O_2} = 0,2(mol)\)

Vậy :

\(m_{KClO_3} = 0,2.122,5 = 24,5(gam)\\ m_{KCl} = 0,2.74,5 = 14,9(gam)\)

\(n_{O_2}=\dfrac{3.36}{22.4}=0.15\left(mol\right)\)

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

\(0,1..............0,1.......0,15\)

\(m_{KClO_3}=0.1\cdot122.5=12.25\left(g\right)\)

\(m_{KCl}=0,1\cdot74,5=7,45\left(g\right)\)

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

b)

Theo PTHH :

\(n_{KCl} = \dfrac{2}{3}n_{O_2} = \dfrac{2}{3}.\dfrac{3,36}{22,4} = 0,1(mol)\\ \Rightarrow m_{KCl} = 0,1.74,5 = 7,45(gam)\)

c)

\(n_{KClO_3} = n_{KCl} = 0,1(mol)\\ \Rightarrow m_{KClO_3} = 0,1.122,5 = 12,25(gam)\)