\(Fe+2HCl\rightarrow FeCl_2+H_2\\ n_{Fe}=\dfrac{14}{56}=0,25\left(mol\right)\\ n_{H_2}=n_{Fe}=0,25\left(mol\right)\\ V_{H_2}=0,25.22,4=5,6\left(l\right)\\ n_{HCl}=2n_{Fe}=0,5\left(mol\right)\\ m_{HCl}=0,5.36,5=18,25\left(g\right)\)

PTHH: Fe + 2HCl → FeCl₂ + H₂

=> m_Fe + m_HCl = m_FeCl2 + m_H2

112 + m_HCl = 254 +5

112 + m_HCl = 258

m_HCl = 258 - 112

m_HCl = 146

Vậy KL của axit clohidric khi tham gia phản ứng là 146(g)

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

$b) n_{Fe} = \dfrac{5,6}{56} = 0,1(mol)$
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: \(V_{H_2}=0.1\cdot22.4=2.24\left(lít\right)\)

Bảo toàn KL: \(m_{Fe}+m_{HCl}=m_{FeCl_2}+m_{H_2}\)

\(\Rightarrow m_{FeCl_2}=5,6+7,3-0,2=12,7(g)\)

\(BTKL:n_{Fe}+n_{HCl}=n_{FeCl_2}+n_{H_2}\\ \Rightarrow n_{FeCl_2}=5,6+7,3-0,2=12,7(g)\)

a: Fe+2HCl->FeCl2+H2

0,1      0,2           0,1

b: nFe=5,6/56=0,1(mol)

=>nHCl=0,2(mol)

mHCl=0,2*36,5=7,3(g)

\(n_{H_2}=\dfrac{44,8}{22,4}=2\left(mol\right)\Rightarrow m_{H_2}=2.2=4\left(g\right)\)

Theo ĐLBTKL: m_Fe + m_HCl = m_FeCl2 + m_H2

=> m_HCl = 254 + 4 - 112 = 146 (g)

BTKLg:

mFe+m HCl=mFeCl2+m H2

=>m HCl=254+\(\dfrac{44,8}{22,4}2\)-112

              =146g

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

PTHH: Fe + 2HCl → FeCl₂ + H₂

Mol:     0,2     0,4                   0,2

b, \(V_{H_2}=0,2.22,4=4,48\left(l\right)\)

c, \(m_{HCl}=0,4.36,5=14,6\left(g\right)\)

\(n_{Fe}=\dfrac{11.2}{56}=0.2\left(mol\right)\)

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

\(0.2.......0.4....................0.2\)

\(V_{H_2}=0.2\cdot22.4=4.48\left(l\right)\)

\(m_{HCl}=0.4\cdot36.5=14.6\left(g\right)\)

PTHH :    \(Fe+2HCl-->FeCl_2+H_2\uparrow\)  (1)

\(n_{Fe}=\dfrac{m}{M}=\dfrac{11.2}{56}=0.2\left(mol\right)\)

Từ (1) => \(n_{Fe}=n_{H_2}=0.2\left(mol\right)\)

=> \(V_{H2\left(đktc\right)}=n.22,4=0,2.22,4=4,48\left(l\right)\)

Từ (1) => \(2n_{Fe}=n_{HCl}=0.4\left(mol\right)\)

=> \(m_{HCl}=n.M=0,4.\left(1+35.5\right)=14.6\left(g\right)\)