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a) \(Fe+2HCl\text{→}FeCl_2+H_2\)
n Fe = 2,8:56=0,05 mol = n H2
V H2 = 0,05.22,4=1,12 lít
n HCl = n Fe .2 =0,1 mol
m HCl = 0,1.(1+35,5)=3,65 g
a) PTHH: \(Fe+2HCl\rightarrow FeCl_2+H_2\uparrow\)
b) \(n_{H_2}=n_{Fe}=\dfrac{2,8}{56}=0,05\left(mol\right)\)
\(\Rightarrow V_{H_2}=n.22,4=0,05.22,4=1,12\left(l\right)\)
c) \(n_{HCl}=2n_{Fe}=0,1\left(mol\right)\)
\(m_{HCl}=n.M=0,1.36,5=3,65\left(g\right)\)
\(n_{HCl}=0,1mol\)
\(Fe+2HCl\rightarrow FeCl_2+H_2\)
0,1 0,2 0,1 0,1
\(m_{FeCl_2}=0,1\cdot127=12,7g\)
\(V_{H_2}=0,1\cdot22,4=2,24l\)
a) $Zn + 2HCl \to ZnCl_2 + H_2$
b) Theo PTHH :
$n_{ZnCl_2} = n_{Zn} = \dfrac{6,5}{65} = 0,1(mol)$
$m_{ZnCl_2} = 0,1.136 = 13,6(gam)$
c)
$n_{H_2} = n_{Zn} = 0,1(mol) \Rightarrow V_{H_2} = 0,1.22,4 = 2,24(lít)$
d)
$n_{HCl} = 2n_{Zn} = 0,2(mol) \Rightarrow C_{M_{HCl}} = \dfrac{0,2}{0,5} = 0,4M$
a) PTHH: Fe + H2SO4 ===> FeSO4 + H2
b) Ta có: nFe =
Theo PTHH, nH2SO4 = nFe = 0,25 (mol)
=> mH2SO4 = 0,25 x 98 = 24,5 (gam)
c) Theo PTHH, nH2 = nFe = 0,25 (mol)
=> VH2(đktc) = 0,25 x 22,4 = 5,6 (l)
d) Theo PTHH, nFeSO4 = nFe = 0,25 (mol)
=> mFeSO4(tạo thành) = 0,25 x 152 = 38 (gam)
\(n_{Fe}=\dfrac{22,4}{56}=0,4\) (mol) (1)
Phương trình hóa học :
Fe + 2HCl ---> FeCl2 + H2 (2)
Từ (1) và (2) ta có \(n_{FeCl_2}=n_{H_2}=0,4\) (mol) ; \(n_{HCl}=0,8\left(mol\right)\)
b) => \(m_{\text{muối}}=0,4.\left(56+35,5.2\right)=50.8\left(g\right)\)
c) \(V_{\text{khí}}=0,4.22,4=8,96\left(l\right)\)
d) \(m_{HCl}=0,8.36.5=29,2\left(g\right)\)
\(\Rightarrow C\%=\dfrac{29,2}{200}.100\%=14,6\%\)
a, \(Zn+2HCl\rightarrow ZnCl_2+H_2\)
b, \(n_{Zn}=\dfrac{6,5}{65}=0,1\left(mol\right)\)
Theo PT: \(n_{H_2}=n_{Zn}=0,1\left(mol\right)\Rightarrow V_{H_2}=0,1.22,4=2,24\left(l\right)\)
c, \(n_{HCl}=2n_{Zn}=0,2\left(mol\right)\Rightarrow m_{HCl}=0,2.36,5=7,3\left(g\right)\)
\(Zn+2HCl\rightarrow ZnCl_2+H_2\)
\(1mol\) \(2mol\) \(1mol\)
\(0,1mol\) \(0,2mol\) \(0,1mol\)
\(n_{Zn}=\dfrac{m}{M}=\dfrac{6,5}{65}=0,1\left(mol\right)\)
\(m_{HCl}=n.M=0,2.36,5=7,3\left(g\right)\)
\(V_{H_2}=n.22,4=0,1.22,4=2,24\left(l\right)\)
a) Fe + 2HCl --> FeCl2 + H2
b) nHCl = 0,2.1 = 0,2 (mol)
PTHH: Fe + 2HCl --> FeCl2 + H2
0,2---->0,1--->0,1
=> mFeCl2 = 0,1.127 = 12,7 (g)
c) VH2 = 0,1.22,4 = 2,24 (l)
a) Zn + 2HCl --> ZnCl2 + H2
b) nHCl = 0,2.1 = 0,2 (mol)
PTHH: Zn + 2HCl --> ZnCl2 + H2
0,2----->0,1---->0,1
=> mZnCl2 = 0,1.136 = 13,6 (g)
c) VH2 = 0,1.22,4 = 2,24 (l)
\(n_{Fe}=\dfrac{2,8}{56}=0,05\left(mol\right)\\ n_{HCl}=\dfrac{400.3,65\%}{36,5}=0,4\left(mol\right)\\ a.Fe+2HCl\rightarrow FeCl_2+H_2\\ Vì:\dfrac{0,05}{1}< \dfrac{0,4}{2}\\ \Rightarrow HCldư\\ b.n_{H_2}=n_{FeCl_2}=n_{Fe}=0,05\left(mol\right)\\ m_{FeCl_2}=127.0,05=6,35\left(g\right)\\ V_{H_2\left(đktc\right)}=0,05.22,4=1,12\left(l\right)\\ c.C\%_{ddHCl\left(đã,dùng\right)}=\dfrac{0,05.2.36,5}{400}.100=0,9125\%\)
a)
$Fe + H_2SO_4 \to FeSO_4 + H_2$
b)
Theo PTHH : $n_{H_2} = n_{Fe} = \dfrac{2,8}{56} =0,05(mol)$
$V_{H_2} = 0,05.22,4 = 1,12(lít)$
c)
$n_{H_2SO_4} = n_{Fe} = 0,05(mol)$
$m_{H_2SO_4} = 0,05.98 = 4,9(gam)$