PT: \(2KMnO_4+16HCl\rightarrow2KCl+2MnCl_2+5Cl_2+8H_2O\)

Ta có: \(n_{Cl_2}=\dfrac{11,2}{22,4}=0,5\left(mol\right)\)

Theo PT: \(\left\{{}\begin{matrix}n_{KMnO_4\left(LT\right)}=\dfrac{2}{5}n_{Cl_2}=0,2\left(mol\right)\\n_{HCl\left(LT\right)}=\dfrac{16}{5}n_{Cl_2}=1,6\left(mol\right)\end{matrix}\right.\)

\(\Rightarrow\left\{{}\begin{matrix}m_{KMnO_4\left(LT\right)}=0,2.158=31,6\left(g\right)\\V_{ddHCl\left(LT\right)}=\dfrac{1,6}{2}=0,8\left(l\right)\end{matrix}\right.\)

Mà: H% = 75%

\(\Rightarrow\left\{{}\begin{matrix}m_{KMnO_4\left(TT\right)}=\dfrac{31,6}{75\%}\approx42,13\left(g\right)\\V_{ddHCl\left(TT\right)}=\dfrac{0,8}{75\%}\approx1,067\left(l\right)\end{matrix}\right.\)

Bạn tham khảo nhé!

\(n_{O_2}=\dfrac{11,2}{22,4}=0,5\left(mol\right)\)

PTHH: 2KMnO₄ --t^o--> K₂MnO₄ + MnO₂ + O₂

               1<------------------------------------0,5

=> \(m_{KMnO_4\left(pthh\right)}=1.158=158\left(g\right)\)

=> \(m_{KMnO_4\left(tt\right)}=\dfrac{158.100}{80}=197,5\left(g\right)\)

\(n_{Cl_2}=\dfrac{2,479}{24,79}=0,1\left(mol\right)\)

PTHH: \(2KMnO_4+16HCl\rightarrow2KCl+2MnCl_2+5Cl_2+8H_2O\)

             0,04<-----------------------------------------------0,1

\(\Rightarrow n_{KMnO_4\left(c\text{ần}.d\text{ùng}\right)}=\dfrac{0,04}{80\%}=0,05\left(mol\right)\)

\(\Rightarrow m_{KMnO_4}=0,05.158=7,9\left(g\right)\)

PT: \(2KMnO_4+16HCl\rightarrow2KCl+2MnCl_2+5Cl_2+8H_2O\)

Ta có: \(n_{Cl_2}=\dfrac{2,479}{24,79}=0,1\left(mol\right)\)

Theo PT: \(n_{KMnO_4\left(LT\right)}=\dfrac{2}{5}n_{Cl_2}=0,04\left(mol\right)\)

Mà: H% = 80% \(\Rightarrow n_{KMnO_4\left(TT\right)}=\dfrac{0,04}{80\%}=0,05\left(mol\right)\)

\(\Rightarrow m_{KMnO_4}=0,05.158=7,9\left(g\right)\)

Đáp án C

Ta có: m_KMnO4 = 300.85% = 255 (kg)

\(\Rightarrow n_{KMnO_4}=\dfrac{255}{158}\left(kmol\right)\)

PT: \(2KMnO_4+16HCl_đ\rightarrow2KCl+2MnCl_2+5Cl_2+8H_2O\)

Theo PT: \(n_{Cl_2\left(LT\right)}=\dfrac{5}{2}n_{KMnO_4}=\dfrac{1275}{316}\left(kmol\right)\)

Mà: H = 65%

\(\Rightarrow n_{Cl_2\left(TT\right)}=\dfrac{1275}{316}.65\%=\dfrac{3315}{1264}\left(kmol\right)\)

\(\Rightarrow V_{Cl_2\left(TT\right)}=\dfrac{3315}{1264}.22,4.1000\approx58746,8\left(l\right)\)

nO2 (TT) = 11,2/22,4 = 0,5 (mol)

nO2 (LT) = 0,5/80% = 0,625 (mol)

PTHH: 2KMnO4 -> (t°) K2MnO4 + MnO2 + O2

nKMnO4 = 0,625 . 2 = 1,25 (mol)

mKMnO4 = 1,25 . 158 = 197,5 (g)

\(n_{O_2}=\dfrac{V_{O_2}}{22,4}=\dfrac{11,2}{22,4}=0,5mol\)

\(2KMnO_4\rightarrow\left(t^o\right)K_2MMnO_4+MnO_2+O_2\)

    1                                                             0,5   ( mol )

\(n_{KMnO_4}=\dfrac{1}{80\%}=1,25mol\)

\(m_{KMnO_4}=n_{KMnO_4}.M_{KMnO_4}=1,25.158=197,5g\)

= 197,5 (g) nhé

Ta có: \(n_{C_2H_2}=\dfrac{168}{22,4}=7,5\left(mol\right)\)

PT: \(CaC_2+2H_2O\rightarrow Ca\left(OH\right)_2+C_2H_2\)

Theo PT: \(n_{CaC_2\left(LT\right)}=n_{C_2H_2}=7,5\left(mol\right)\)

Mà: H = 90%

\(\Rightarrow n_{CaC_2\left(TT\right)}=\dfrac{7,5}{90\%}=\dfrac{25}{3}\left(mol\right)\)

\(\Rightarrow m_{CaC_2\left(TT\right)}=\dfrac{25}{3}.64=\dfrac{1600}{3}\left(g\right)\)

Mà: Đất đèn chứa 80% CaC₂.

⇒ m _{đất đèn} = 1600/3 : 80% = 2000/3 (g)

Giúp mình vs ❤❤❤Help me....

\(n_{O_2}=\dfrac{V}{22,4}=\dfrac{6,27}{22,4}\simeq0,28\)

PTHH: 2KMnO4 --t--> \(K_2MnO_4+MnO_2+O_2\)

Vậy: ----0,56mol--------------------------------------0,28 mol

Khối lượng KMnO4 phản ứng là:

\(m=M.n=0,56.197=110,32\)

Khối lượng KMnO4 ần để phản ứng là:

\(m_{KMnO_4}=m:80\%=137,9\)

\(n_{Cl_2}=\frac{4,48}{22,4}=0,2\left(mol\right)\)

\(PTHH:2HCl\underrightarrow{t^o}H_2+Cl_2\)

(mol)_____0,4___0,2____0,2_

Do \(H=80\%\Rightarrow n_{HCl\left(tt\right)}=\frac{0,4}{80\%}=0,5\left(mol\right)\)

\(V_{HCl}=\frac{0,5}{2,5}=0,2\left(l\right)\)

nCl2=4,48\22,4=0,2(mol)

2HCl−đp−>2H2+Cl2

0,4-------------------0,2

->VHCl=0,4\2,5=0,16(l)

H=80%

->VHCl=0,16.100\80=0,2(l)