CaCO3 KMnO4 chất đc dùng đẻ điều chế oxi là
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2Al+3H2SO4->Al2(SO4)3+3H2O
0,15------------------0,075--------0,225
n Al=0,15 mol
=>m Al2(SO4)3=0,075.342=25,65g
=>VH2=0,225.22,4=5,04l
\(n_{Ba}=\dfrac{109,6}{137}=0,8\left(mol\right)\\ m_{ddHCl}=200.1,1=220\left(g\right)\\ \rightarrow m_{HCl}=20\%.220=44\left(g\right)\\ \rightarrow n_{HCl}=\dfrac{44}{36,5}=1,205\left(mol\right)\)
PTHH: Ba + 2HCl ---> BaCl2 + H2
LTL: \(0,6< \dfrac{1,205}{2}\rightarrow\) HCl dư
Theo pthh: \(n_{H_2}=n_{Ba}=n_{BaCl_2}=0,6\left(mol\right)\)
\(\rightarrow V_{H_2}=0,6.22,4=13,44\left(l\right)\)
\(m_{dd}=220+109,6=329,6\left(g\right)\)
\(m_{BaCl_2}=0,6.208=124,8\left(g\right)\)
Theo pthh: \(n_{HCl\left(pư\right)}=2n_{Ba}=2.0,6=1,2\left(mol\right)\)
=> \(\left\{{}\begin{matrix}C\%_{BaCl_2}=\dfrac{124,8}{329,6}=36,86\%\\C\%_{HCl\left(dư\right)}=\dfrac{0,05.36,5}{329,6}=0,55\%\end{matrix}\right.\)
\(n_{Al}=\dfrac{8,1}{27}=0,3mol\)
\(2Al+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2\)
0,3 0,45 0,15 0,45
a)\(m_{H_2SO_4bđ}=0,45\cdot98=44,1g\)
b)\(m_{ddH_2SO_4}=\dfrac{44,1}{10\%}\cdot100\%=441g\)
\(m_{H_2}=0,45\cdot2=0,9g\)
\(BTKL:m_{Al}+m_{ddH_2SO_4}=m_{Al_2\left(SO_4\right)_3}+m_{H_2}\)
\(\Rightarrow m_{Al_2\left(SO_4\right)_3}=8,1+441-0,9=448,2g\)
c)\(m_{Al_2\left(SO_4\right)_3}=0,15\cdot342=51,3g\)
\(C\%=\dfrac{51,3}{448,2}\cdot100\%=11,44\%\)
a) \(n_{Zn}=\dfrac{3,25}{65}=0,05\left(mol\right)\)
\(n_{HCl}=1.0,2=0,2\left(mol\right)\)
PTHH: Zn + 2HCl --> ZnCl2 + H2
0,05-->0,1---->0,05-->0,05
=> VH2= 0,05.22,4 = 1,12 (l)
b) \(\left\{{}\begin{matrix}C_{M\left(ZnCl_2\right)}=\dfrac{0,05}{0,2}=0,25M\\C_{M\left(HCl.dư\right)}=\dfrac{0,2-0,1}{0,2}=0,5M\end{matrix}\right.\)
\(n_K=\dfrac{9,75}{39}=0,25\left(mol\right)\)
\(n_{HCl}=\dfrac{300.7,3\%}{36,5}=0,6\left(mol\right)\)
PTHH: 2K + 2HCl --> 2KCl + H2
Xét tỉ lệ: \(\dfrac{0,25}{2}< \dfrac{0,6}{2}\) => HCl dư
PTHH: 2K + 2HCl --> 2KCl + H2
0,25-->0,25-->0,25-->0,125
=> VH2 = 0,125.22,4 = 2,8 (l)
mKCl = 0,25.74,5 = 18,625 (g)
mdd sau pư = 9,75 + 300 - 0,125.2 = 309,5 (g)
mHCl(dư) = (0,6 - 0,25).36,5 = 12,775 (g)
\(\left\{{}\begin{matrix}C\%_{KCl}=\dfrac{18,625}{309,5}.100\%=6,018\%\\C\%_{HCl}=\dfrac{12,775}{309,5}.100\%=4,128\%\end{matrix}\right.\)
TL:
Tham khảo nhé:
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@tuantuthan
HT
\(n_{hhkhí}=\dfrac{16,8}{22,4}=0,75\left(mol\right)\)
Gọi \(n_{SO_2}=a\left(mol\right)\left(0< a< 0,75\right)\)
\(\rightarrow n_{O_2\left(dư\right)}=0,75-b\left(mol\right)\)
Ta có: \(\dfrac{64a+32\left(0,75-a\right)}{0,75}=\dfrac{33,6}{1}=33,6\left(\dfrac{g}{mol}\right)\)
\(\rightarrow a=0,0375\left(mol\right)\)
\(\rightarrow\left\{{}\begin{matrix}\%V_{SO_2}=\dfrac{0,0375}{0,75}=5\%\\\%V_{O_2\left(dư\right)}=100\%-5\%=95\%\end{matrix}\right.\)
KMnO4
KMnO4