1)Cho 36,6g hh Na2SO3 và CaSO3 tác dụng vừa đủ dd HCl, thu đ. 6,72 lít khí .khối lượng Na2SO3 trong hhh?
K
Khách
Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
Những câu hỏi liên quan
17 tháng 9 2021
PTHH: \(Na_2SO_3+2HCl\rightarrow2NaCl+H_2O+SO_2\uparrow\)
Ta có: \(n_{SO_2}=\dfrac{2,479}{22,4}=\dfrac{2479}{22400}\left(mol\right)\)
\(\Rightarrow\left\{{}\begin{matrix}n_{Na_2SO_3}=\dfrac{2479}{22400}\left(mol\right)\\n_{HCl}=\dfrac{2479}{11200}\left(mol\right)\end{matrix}\right.\) \(\Rightarrow\left\{{}\begin{matrix}m_{Na_2SO_3}=\dfrac{2479}{22400}\cdot126\approx13,94\left(g\right)\\C_{M_{HCl}}=\dfrac{\dfrac{2479}{11200}}{0,25}\approx0,89\left(M\right)\end{matrix}\right.\)
2 tháng 8 2021
PTHH: \(K_2O+2HCl\rightarrow2KCl+H_2O\)
\(K_2SO_3+2HCl\rightarrow2KCl+SO_2\uparrow+H_2O\)
a) Ta có: \(\left\{{}\begin{matrix}n_{HCl}=\dfrac{200\cdot14,6\%}{36,5}=0,8\left(mol\right)\\n_{SO_2}=\dfrac{6,72}{22,4}=0,3\left(mol\right)\end{matrix}\right.\) \(\Rightarrow\left\{{}\begin{matrix}n_{K_2SO_3}=0,3\left(mol\right)\\n_{K_2O}=0,1\left(mol\right)\end{matrix}\right.\)
\(\Rightarrow\left\{{}\begin{matrix}\%m_{K_2O}=\dfrac{0,1\cdot94}{0,1\cdot94+0,3\cdot158}\cdot100\%\approx16,55\%\\\%m_{K_2SO_3}=83,45\%\end{matrix}\right.\)
b) Theo các PTHH: \(n_{KCl}=0,8\left(mol\right)\) \(\Rightarrow m_{KCl}=74,5\cdot0,8=59,6\left(g\right)\)
Mặt khác: \(\left\{{}\begin{matrix}m_{hh}=56,8\left(g\right)\\m_{SO_2}=0,3\cdot64=19,2\left(g\right)\end{matrix}\right.\)
\(\Rightarrow m_{dd}=m_{hh}+m_{ddHCl}-m_{SO_2}=237,6\left(g\right)\)
\(\Rightarrow C\%_{KCl}=\dfrac{59,6}{237,6}\cdot100\%\approx25,1\%\)
5 tháng 6 2023
\(Zn+2HCl->ZnCl_2+H_2\\ Mg+2HCl->MgCl_2+H_2\\ n_{Zn}=a\\ n_{Mg}=b\\ 65a+24b=11,3g\\ n_{H_2}=a+b=\dfrac{6,72}{22,4}=0,3\\ a=0,1\\ m_{Zn}=65.0,1=6,5g\)
3 tháng 4 2022
a)
\(n_{MgCl_2}=\dfrac{38}{95}=0,4\left(mol\right)\)
\(n_{CO_2}=\dfrac{6,72}{22,4}=0,3\left(mol\right)\)
PTHH: MgCO3 + 2HCl --> MgCl2 + CO2 + H2O
0,3<------0,6<------0,3<----0,3
MgO + 2HCl --> MgCl2 + H2O
0,1<---0,2<------0,1
=> \(\left\{{}\begin{matrix}m_{MgO}=0,1.40=4\left(g\right)\\m_{MgCO_3}=0,3.84=25,2\left(g\right)\end{matrix}\right.\)
b) \(m_{HCl}=\left(0,6+0,2\right).36,5=29,2\left(g\right)\)
=> \(m_{dd.HCl}=\dfrac{29,2.100}{20}=146\left(g\right)\)
23 tháng 11 2021
\(PTHH:Na_2SO_3+2HCl\rightarrow2NaCl+H_2O+SO_2\uparrow\\ K_2SO_3+2HCl\rightarrow2KCl+H_2O+SO_2\uparrow\\ n_{SO_2}=\dfrac{4,48}{22,4}=0,2\left(mol\right)\\ \Rightarrow\left\{{}\begin{matrix}n_{Na_2SO_3}+n_{K_2SO_3}=0,2\\126n_{Na_2SO_3}+158n_{K_2SO_3}=28,4\end{matrix}\right.\\ \Rightarrow\left\{{}\begin{matrix}n_{Na_2SO_3}=0,1\left(mol\right)\\n_{K_2SO_3}=0,1\left(mol\right)\end{matrix}\right.\)
\(\Rightarrow\%_{m_{Na_2SO_3}}=\dfrac{0,1\cdot126}{28,4}\cdot100\%\approx44\%\\ \Rightarrow\%_{m_{K_2SO_3}}=100\%-44\%=56\%\)
\(n_{HCl}=0,1\cdot2+0,1\cdot2=0,4\left(mol\right)\\ \Rightarrow m_{CT_{HCl}}=0,4\cdot36,5=14,6\left(g\right)\\ \Rightarrow C\%_{HCl}=\dfrac{14,6}{200}\cdot100\%=7,3\%CC\)
21 tháng 2 2022
Gọi \(\left\{{}\begin{matrix}n_{Al}=x\left(mol\right)\\n_{Zn}=y\left(mol\right)\end{matrix}\right.\)
\(n_{HCl}=0,2\cdot4=0,8mol\)
\(2Al+6HCl\rightarrow2AlCl_3+3H_2\)
\(x\) \(\rightarrow\) \(3x\) \(x\)
\(Zn+2HCl\rightarrow ZnCl_2+H_2\)
\(y\) \(\rightarrow\) \(2y\) \(y\)
\(\Rightarrow\left\{{}\begin{matrix}27x+65y=11,9\\3x+2y=0,8\end{matrix}\right.\Rightarrow\left\{{}\begin{matrix}x=0,2\\y=0,1\end{matrix}\right.\)
a)\(\%m_{Al}=\dfrac{0,2\cdot27}{11,9}\cdot100\%=45,38\%\)
\(\%m_{Zn}=100\%-45,38\%=54,62\%\)
b)\(\Sigma n_{H_2}=\dfrac{3}{2}x+y=\dfrac{3}{2}\cdot0,2+0,1=0,4mol\)
\(V_{H_2}=0,4\cdot22.4=8,96l\)
30 tháng 10 2021
\(m_{NaOH}=\dfrac{200\cdot8}{100}=16\left(g\right)\Rightarrow n_{NaOH}=\dfrac{16}{40}=0,4mol\)
\(NaOH+HCl\rightarrow NaCl+H_2O\)
0,4 0,4 0,4 0,4
a)\(m_{HCl}=0,4\cdot36,5=14,6\left(g\right)\)
\(\Rightarrow m_{ddHCl}=\dfrac{14,6}{7,3}\cdot100=200\left(g\right)\)
b)\(m_{NaCl}=0,4\cdot58,5=23,4\left(g\right)\)
\(m_{H_2O}=0,4\cdot18=7,2\left(g\right)\)
\(m_{ddsau}=200+200-7,2=392,8\left(g\right)\)
\(\Rightarrow C\%=\dfrac{23,4}{392,8}\cdot100=5,96\%\)
c) \(n_{SO_2}=\dfrac{6,72}{22,4}=0,3mol\)
\(2NaOH+SO_2\rightarrow Na_2SO_4+H_2O\)
0,4 0,3 0,3 0,3
\(m_{Na_2SO_4}=0,3\cdot142=42,6\left(g\right)\)
Na2CO3+2HCl→2NaCl+H2O+CO2
x---------------------------------------------x
CaCO3+2HCl→CaCl2+H2O+CO2
y----------------------------------------y
=>Ta có :\(\left\{{}\begin{matrix}126x +120y=36,6\\x+y=0,3\end{matrix}\right.\)
=>x=0,1 mol , y=0,2 mol
=>m Na2SO3=0,1.126=12,6g