a: \(Fe+2HCl\rightarrow FeCl_2+H_2\uparrow\)

0,1           0,2       0,1           0,1

b: \(V_{H_2}=0.1\cdot22.4=2.24\left(lít\right)\)

c: \(m_{FeCl_2}=0.1\left(56+35.5\cdot2\right)=12.7\left(g\right)\)

$a) Fe + 2HCl \to FeCl_2 + H_2$

$b) n_{Fe} = \dfrac{5,6}{56} = 0,1(mol)$
Theo PTHH : $n_{HCl} = 2n_{Fe} = 0,1.2 = 0,2(mol)$
$m_{HCl} = 0,2.36,5 = 7,3(gam)$
$c) n_{H_2} = n_{Fe} = 0,1(mol)$
$V_{H_2} = 0,1.22,4 = 2,24(lít)$

a: \(Fe+2HCl\rightarrow FeCl_2+H_2\)

b: \(n_{Fe}=\dfrac{5.6}{56}=0.1\left(mol\right)=n_{FeCl_2}\)

\(\Leftrightarrow n_{HCl}=2\cdot0.1=0.2\left(mol\right)\)

\(m=0.2\cdot36.5=7.3\left(g\right)\)

c: \(V_{H_2}=0.1\cdot22.4=2.24\left(lít\right)\)

\(a. Fe+2HCl->FeCl_2+H_2\)

c, \(n_{Fe}=\dfrac{5,6}{56}=0,1\)

\(-> n_{H_2}=n_{FeCl_2}=0,1\)

\(-> V_{H_2}=0,1.22,4=2,24\)

a) \(PTHH:Fe+HCL\) → \(FeCl_2+H_2\)

Cân bằng: \(Fe+2HCl\) → \(FeCl_2+H_2\)

b) \(n_{Fe}=\dfrac{m}{M}=\dfrac{5,6}{56}=0,1\left(mol\right)\)

\(n_{HCl}=2.n_{Fe}=2.0,1=0,2\left(mol\right)\)

\(m_{HCl}=n.M=0,2.36,5=7,3\left(g\right)\)

c) \(n_{Fe}=n_{H_2}=0,1\left(mol\right)\)

\(V_{H_2\left(đktc\right)}=n.22,4=0,1.22,4=2,24\left(l\right)\)

\(n_{Fe}=\dfrac{11,2}{56}=0,2\left(mol\right)\)

PTHH: Fe + 2HCl --> FeCl₂ + H₂

          0,2------------>0,2----->0,2

=> \(\left\{{}\begin{matrix}m_{FeCl_2}=0,2.127=25,4\left(g\right)\\V_{H_2}=0,2.22,4=4,48\left(l\right)\end{matrix}\right.\)

\(n_{Zn}=\dfrac{3,25}{65}=0,05\left(mol\right)\)

a) Pt : \(Zn+2HCl\rightarrow ZnCl_2+H_2|\)

            1          2             1           1

         0,05      0,1                       0,05

b) \(n_{H2}=\dfrac{0,05.1}{1}=0,05\left(mol\right)\)

\(V_{H2\left(dktc\right)}=0,05.22,4=1,12\left(l\right)\)

c) \(n_{HCl}=\dfrac{0,05.2}{1}=0,1\left(mol\right)\)

200ml = 0,2l

\(C_{M_{ddHCl}}=\dfrac{0,1}{0,2}=0,5\left(M\right)\)

 Chúc bạn học tốt

Bài 3:

$n_{Fe}=\dfrac{11,2}{56}=0,2(mol)$

$Fe+2HCl\to FeCl_2+H_2\uparrow$

Theo PT: $n_{FeCl_2}=n_{H_2}=0,2(mol)$

$\Rightarrow m_{FeCl_2}=0,2.127=25,4(g);V_{H_2}=0,2.22,4=4,48(lít)$

$\Rightarrow m=25,4;V=4,48$

Bài 4:

$CuO+H_2SO_4\to CuSO_4+H_2O$

Theo PT; $n_{H_2SO_4}=n_{CuSO_4}=n_{CuO}=\dfrac{32}{80}=0,4(mol)$

$\Rightarrow m_{H_2SO_4}=0,4.98=39,2(g)$

$m_{CuSO_4}=0,4.160=64(g)$

\(n_{Fe}=\dfrac{2.8}{56}=0.05\left(mol\right)\)

\(Fe+2HCl\rightarrow FeCl_2+H_2\)

\(0.05......0.1\)

\(m_{HCl}=0.1\cdot36.5=3.65\left(g\right)\)

Chỉ tìm được khối lượng HCl thoi em nhé !

Áp dụng ĐLBTKL, ta có:

m_Fe + m_HCl = \(m_{FeCl_2}\) + \(m_{H_2}\)

\(m_{Fe}=5,6g\)

\(m_{HCl}=7,3g\)

\(m_{FeCl_2}=11,9g\)

=> \(5,6+7,3=11,9+m_{H_2}\)

\(m_{H_2}=12,9-11,9=1\left(g\right)\)

Vậy khối lượng khí H₂ thoát ra là 1 g.

PTHH: Fe + 2HCl ===> FeCl₂ + H₂

Áp dụng định luật bảo toàn khối lượng, ta có:

m_H2 = m_Fe + m_HCl - m_FeCl2

= 5,6 + 7,3 - 11,9 = 1 gam