nhầm lớp rồi anh ơi

đây lớp 7 mà

Bài 2 : 

\(n_{KClO3}=\dfrac{36,75}{122,5}=0,3\left(mol\right)\)

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

            2             2           3

          0,3                        0,45

\(n_{O2}=\dfrac{0,3.3}{2}=0,45\left(mol\right)\)

\(V_{O2\left(dktc\right)}=0,45.22,4=10,08\left(l\right)\)

Pt : \(4P+5O_2\underrightarrow{t^o}2P_2O_5|\)

        4       5            2

      0,36  0,45       0,18

\(n_P=\dfrac{0,45.4}{5}=0,36\left(mol\right)\)

⇒ \(m_P=0,36.31=11,16\left(g\right)\)

\(n_{P2O5}=\dfrac{0,45.2}{5}=0,18\left(mol\right)\)

⇒ \(m_{P2O5}=0,18.142=25,56\left(g\right)\)

 Chúc bạn học tốt

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)

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

PTHH: 2KClO₃ --to--> 2KCl + 3O₂ - pư phân huỷ

             0,1                    0,1      0,15

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

a) \(n_{O_2}=\dfrac{6,72}{22,4}=0,3\left(mol\right)\)

PTHH: 2KClO₃ --t^o--> 2KCl + 3O₂

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

=> \(m_{KClO_3}=0,2.122,5=24,5\left(g\right)\)

b) \(n_{KClO_3}=\dfrac{490}{122,5}=4\left(mol\right)\)

PTHH: 2KClO₃ --t^o--> 2KCl + 3O₂

                4-------------->4---->6

=> \(m_{KCl}=4.74,5=298\left(g\right)\)

=> \(m_{O_2}=6.32=192\left(g\right)\)

2KClO₃ \(\underrightarrow{t^o}\) 2KCl + 3O₂

a, \(n_{O_2}=\dfrac{6,72}{22,4}=0,3mol\\ n_{KClO_3}=\dfrac{0,3.2}{3}=0,2mol\\ m_{KClO_3}=0,2.122,5=24,5g\)

b, \(n_{KClO_3}=\dfrac{490}{122,5}=4mol\)

\(\Rightarrow m_{KCl}=4.74,5=298g\)

\(n_{O_2}=\dfrac{4.3}{2}=6mol\\ m_{O_2}=6.32=192g\)

PTHH: \(2KClO_3\rightarrow3O_2+2KCl\)

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

\(24,5=9,6+m_{KCl}\)

\(\Rightarrow m_{KCl}=24,5-9,6\)

\(m_{KCl}=14,9\left(g\right)\)

Vậy \(m_{KCl}=14,9\left(g\right)\)

pthh: 2KClO₃ = 2KCl +3O₂

m_kcl = m_kclo - m_o = 24,5 - 9,6 = 14,9g

PTHH:

\(2KClO_3=3O_2+2KCl\)

Theo ĐLBTKL, ta có:

\(m_{KCl}=m_{KClo_3}-m_{O_2}\)

Thay số:

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

Vậy khối lượng của muối kaliclorua thu được sau phản ứng là 14,9 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)

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

\(n_{KCl}=\dfrac{7,45}{74,5}=0,1\) (mol)

\(2KClO_3\rightarrow^{500^oC}2KCl+3O_2\)  

      0,1                 0,1       0,15  /mol

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

\(a=0,1.122,5=12,25\left(g\right)\)