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Ta có: \(n_{Zn}=\dfrac{13}{65}=0,2\left(mol\right)\)
PT: \(Zn+2HCl\rightarrow ZnCl_2+H_2\)
a, nH2 = nZn = 0,2 (mol)
⇒ VH2 = 0,2.24,79 = 4,958 (l)
b, nZnCl2 = nZn = 0,2 (mol)
⇒ mZnCl2 = 0,2.136 = 27,2 (g)
c, \(H=\dfrac{3,225}{4,958}.100\%\approx65,05\%\)
\(n_{Al}=\dfrac{m}{M}=\dfrac{0,54}{27}=0,02mol\)
\(n_{H_2SO_4}=\dfrac{m}{M}=\dfrac{22,05}{98}=0,225mol\)
\(2Al+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2\)
0,02 < 0,225 ( mol )
0,02 0,03 ( mol )
\(V_{H_2}=n.22,4=0,03.24,79=0,7437l\)
Ở đkc, 1 mol khí chiếm thể tích 24,79 lít
\(n_{Fe}=\dfrac{11,2}{56}=0,2\left(mol\right)\\ PTHH:Fe+2HCl\rightarrow FeCl_2+H_2\\ \Rightarrow n_{H_2}=n_{Fe}=0,2\left(mol\right)\\ \Rightarrow V_{H_2\left(đkc\right)}=24,79\cdot0,2=4,958\left(l\right)\)
a)
\(PTHH:Zn+2HCl\rightarrow ZnCl_2+H_2\uparrow\)
b)
\(n_{Zn}=\dfrac{13}{65}=0,2\left(mol\right)\)
Theo PT:\(n_{H_2}=n_{Zn}=0,2mol\)
\(\Rightarrow V_{H_2}=0,2.24,79=4,958l\)
a, \(Zn+2HCl\rightarrow ZnCl_2+H_2\)
b, \(n_{Zn}=\dfrac{13}{65}=0,2\left(mol\right)\)
Theo PT: \(n_{H_2}=n_{Zn}=0,2\left(mol\right)\)
\(\Rightarrow V_{H_2}=0,2.24,79=4,958\left(l\right)\)
\(n_{Mg}=\dfrac{4,8}{24}=0,2\left(mol\right)\)
PTHH: Mg + H2SO4 → MgSO4 + H2
Mol: 0,2 0,2
\(V_{H_2}=0,2.24,79=4,958\left(l\right)\)
⇒ Chọn C
a, \(Fe+2HCl\rightarrow FeCl_2+H_2\)
b, Ta có: \(n_{Fe}=\dfrac{5,6}{56}=0,1\left(mol\right)\)
Theo PT: \(n_{FeCl_2}=n_{H_2}=n_{Fe}=0,1\left(mol\right)\)
\(\Rightarrow V_{H_2}=0,1.24,79=2,479\left(l\right)\)
\(m_{FeCl_2}=0,1.127=12,7\left(g\right)\)
\(a,n_{Mg}=\dfrac{4,8}{24}=0,2\left(mol\right)\\ Mg+2HCl\rightarrow MgCl_2+H_2\\ b,n_{MgCl_2}=n_{H_2}=n_{Mg}=0,2\left(mol\right)\\ b,V_{H_2\left(25\text{đ}\text{ộ}C,1bar\right)}=0,2.24,79=4,958\left(l\right)\\ c,n_{HCl}=2.0,2=0,4\left(mol\right)\\ m_{\text{dd}HCl}=\dfrac{0,4.36,5.100}{10}=146\left(g\right)\\ m_{\text{dd}A}=m_{Mg}+m_{\text{dd}HCl}-m_{H_2}=4,8+146-0,2.2=150,4\left(g\right)\\ d,C\%_{\text{dd}MgCl_2}=\dfrac{95.0,2}{150,4}.100\approx12,633\%\)
a, \(Mg+2HCl\rightarrow MgCl_2+H_2\)
b, \(n_{H_2}=\dfrac{9,916}{24,79}=0,4\left(mol\right)\)
Theo PT: \(n_{Mg}=n_{MgCl_2}=n_{H_2}=0,4\left(mol\right)\)
\(\Rightarrow m_{Mg}=0,4.24=9,6\left(g\right)\)
c, \(m_{MgCl_2}=0,4.95=38\left(g\right)\)
d, Bạn bổ sung thêm thể tích dd HCl nhé.
PTHH: \(Zn+2HCl\rightarrow ZnCl_2+H_2\uparrow\)
Ta có: \(n_{Zn}=\dfrac{9,75}{65}=0,15\left(mol\right)\)
\(\Rightarrow\left\{{}\begin{matrix}n_{HCl}=0,3\left(mol\right)\\n_{ZnCl_2}=0,15\left(mol\right)=n_{H_2}\end{matrix}\right.\) \(\Rightarrow\left\{{}\begin{matrix}V_{H_2}=0,15\cdot22,4=3,36\left(l\right)\\m_{ZnCl_2}=0,15\cdot136=20,4\left(g\right)\\C_{M_{HCl}}=\dfrac{0,3}{0,2}=1,5\left(M\right)\end{matrix}\right.\)
a. PTHH: \(Fe+2HCl\rightarrow FeCl_2+H_2\)
b. \(n_{H_2}=\frac{3,7185}{24,79}=0,15mol\)
Theo phương trình \(m_{Fe}=n_{H_2}=0,15mol\)
\(m_{Fe}=0,15.56=8,4g\)