\(n_{O_2\left(dktc\right)}=\dfrac{V}{22,4}=\dfrac{11,2}{22,4}=0,5\left(mol\right)\\ PTHH:2KClO_3-^{t^o}>2KCl+3O_2\)

tỉ lệ            2            :          2      :    3

n(mol)     `1/3`<------------`1/3`<-----`0,5`

\(m_{KClO_3}=n\cdot M=\dfrac{1}{3}\cdot\left(39+35,5+16\cdot3\right)\approx40,83\left(g\right)\)

\(n_{O_2}=\dfrac{13,44}{22,4}=0,6mol\)

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

    0,4                                               0,6  ( mol )

\(m_{KClO_3}=0,4.122,5=49g\)

a.\(n_{Cu}=\dfrac{6,4}{64}=0,1mol\)

\(2Cu+O_2\rightarrow\left(t^o\right)2CuO\)

0,1       0,05                       ( mol )

\(V_{kk}=\left(0,05.22,4\right).5=5,6l\)

b.\(2KClO_3\rightarrow\left(t^o\right)2KCl+3O_2\)

      1/30                                0,05      ( mol )

\(m_{KClO_3}=\dfrac{1}{30}.122,5=4,08g\)

a, PT: \(3Fe+2O_2\underrightarrow{t^o}Fe_3O_4\)

Ta có: \(n_{Fe_3O_4}=\dfrac{4,64}{232}=0,02\left(mol\right)\)

Theo PT: \(\left\{{}\begin{matrix}n_{Fe}=3n_{Fe_3O_4}=0,06\left(mol\right)\\n_{O_2}=2n_{Fe_3O_4}=0,04\left(mol\right)\end{matrix}\right.\)

\(\Rightarrow m_{Fe}=0,06.56=3,36\left(g\right)\)

\(m_{O_2}=0,04.32=1,28\left(g\right)\)

b, Phần này đề bài cho là KMnO₄ hay KClO₃ vậy bạn?

a) 

nFe3O4 = 4.64/232 = 0.02 (mol) 

3Fe + 2O2 -to-> Fe3O4 

0.06__0.04______0.02 

mFe = 0.06*56 = 3.36 (g) 

Ủa kali pemanganat là KMnO4 mà ta ? 

2KMnO4 -to-> K2MnO4 + MnO2 + O2 

0.08_________________________0.04 

mKMnO4 = 0.08*158 = 12.64 (g) 

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)

\(n_{Fe}=\dfrac{1,68}{56}=0,03\left(mol\right)\)

\(3Fe+2O_2\rightarrow\left(t^o\right)Fe_3O_4\)

 0,03   0,02               0,01  ( mol )

\(m_{Fe_3O_4}=0,01.232=2,32\left(g\right)\)

\(V_{kk}=0,02.22,4.5=2,24\left(l\right)\)

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

   \(\dfrac{1}{75}\)                               0,02   ( mol )

\(m_{KClO_3}=\dfrac{1}{75}.122,5=1,63\left(g\right)\)

a,nFe=1,68/56=0,03 mol

Ta có PTHH : 3Fe + 2O2 --> Fe3O4 (1) ( ở trên dấu --> có to nha )

Theo PTHH ta có :

nFe3O4=1/3nFe=1/3.0,03=0,01 mol

nO2=2/3nFe=2/3.0,03=0,02 mol

=>mFe3O4= 0,01.232=2,32g

=>Vkk=5.(0,02.22,4)=2,24 l

b, Ta có PTHH: 2KClO3 --> 2KCl + 3O2 (2) ( trên dấu --> vẫn có to )

Gọi x là số mol KClO3 cần dùng ( x > 0 )

Theo PTHH (3) và theo bài ra ta có PTHH sau:

2/3x=0,02 

=> x=0,03 mol

=> mKClO3= 0,03.122,5= 3,675g

a) \(n_{Fe}=\dfrac{28}{56}=0,5\left(mol\right)\)

b) \(n_{Al}=\dfrac{13,5}{27}=0,5\left(mol\right)\)

c) \(n_{CO_2}=\dfrac{11}{44}=0,25\left(mol\right)\)

d) \(m_{O_2}=\dfrac{4,958.0,99}{0,082.\left(273+25\right)}=0,2\left(mol\right)\)

e) \(m_{CH_4}=\dfrac{12,359.0,99}{0,082\left(273+25\right)}=0,5\left(mol\right)\)

a: \(n=\dfrac{28}{56}=0.5\left(mol\right)\)

b: \(n=\dfrac{13.5}{27}=0.5\left(mol\right)\)

\(a)\ n_{O_2} = \dfrac{6,72}{22,4} = 0,3(mol)\\ 2KMnO_4 \xrightarrow{t^o} K_2MnO_4 + MnO_2 + O_2\\ n_{KMnO_4} = 2n_{O_2} = 0,3.2 = 0,6(mol)\\ \Rightarrow m_{KMnO_4} = 0,6.158 = 94,8(gam)\\ b)\ n_{KClO_3} = \dfrac{24,5}{122,5} = 0,2(mol)\\ 2KClO_3 \xrightarrow{t^o} 2KCl + 3O_2\\ n_{O_2} = \dfrac{3}{2}n_{KClO_3} = 0,3(mol)\\ \Rightarrow m_{O_2} = 0,3.32 = 9,6(gam)\)

a) nO₂ = \(\dfrac{6,72}{22,4}=0,3\left(mol\right)\)

Pt: \(2KMnO_4\rightarrow K_2MnO_4+MnO_2+O_2\)

Theo pt: \(n_{KMnO_4}=2nO_2=0,6\left(mol\right)\Rightarrow m_{KMnO_4}=0,6.158=94,8g\)

b) \(n_{KClO_3}=\dfrac{24,5}{122,5}=0,3\left(mol\right)\)

\(Pt:2KClO_3\rightarrow2KCl+3O_2\)

\(nO_2=\dfrac{3}{2}n_{KClO_3}=0,45\left(mol\right)\Rightarrow mO_2=0,45.32=14,4g\)

1. \(n_{O_2}=\frac{V}{22,4}=\frac{6,72}{22,4}=0,3\left(mol\right)\)

2.

\(n_{CO_2}=\frac{m}{M}=\frac{4,4}{44}=0,1\left(mol\right)\)

\(n_{O_2}=\frac{m}{M}=\frac{3,2}{32}=0,1\left(mol\right)\)

\(V_{HC}=n.22,4=\left(0,1+0,1\right).22,4=4,48\left(l\right)\)

1. n= 0.3 mol

V= 4,48 l