\(n_{Fe}=\dfrac{11,2}{56}=0,2\left(mol\right)\\ n_{HCl}=0,5.1=0,5\left(mol\right)\\ Fe+2HCl\rightarrow FeCl_2+H_2\\ Vì:\dfrac{0,2}{1}< \dfrac{0,5}{2}\\ \Rightarrow HCldư\\ \Rightarrow n_{H_2}=n_{FeCl_2}=n_{Fe}=0,2\left(mol\right)\\ n_{HCl\left(dư\right)}=0,5-2.0,2=0,1\left(mol\right)\\ a.V_{H_2\left(đktc\right)}=0,2.22,4=4,48\left(l\right)\\ b.m_{ddsau}=11,2+500.1,132-0,2.2=576,8\left(g\right)\\ C\%_{ddHCl\left(dư\right)}=\dfrac{0,1.36,5}{576,8}.100\approx0,633\%\\ C\%_{ddFeCl_2}=\dfrac{0,2.127}{576,8}.100\approx4,404\%\)
a)
$n_{Fe} = \dfrac{11,2}{56} = 0,2(mol) ; n_{HCl} = 0,5(mol)$
$Fe + 2HCl \to FeCl_2 + H_2$
Ta thấy :
$n_{Fe} : 1 < n_{HCl} : 2$ nên HCl dư
$n_{H_2} = n_{Fe} = 0,2(mol) \Rightarrow V_{H_2} = 0,2.22,4 = 4,48(lít)$
b)
$m_{dd\ HCl} = 500.1,132. = 566(gam)$
$m_{dd\ sau\ pư} = 11,2 + 566 - 0,2.2 = 576,8(gam)$
$C\%_{FeCl_2} = \dfrac{0,2.127}{576,8}.100\% = 4,4\%$
$C\%_{HCl} = \dfrac{(0,5 - 0,2.2).36,5}{576,8}.100\% = 0,632\%$
\(n_{Fe}=\dfrac{11,2}{56}=0,2\left(mol\right)\)
500ml =0,5l
\(n_{HCl}=1.0,5=0,5\left(mol\right)\)
Pt : \(Fe+2HCl\rightarrow FeCl_2+H_2|\)
1 2 1 1
0,2 0,5 0,2 0,2
a) Lập tỉ số so sánh : \(\dfrac{0,2}{1}< \dfrac{0,5}{2}\)
⇒ Fe phản ứng hết , HCl dư
⇒ Tính toán dựa vào số mol của Fe
\(n_{H2}=\dfrac{0,2.1}{1}=0,2\left(mol\right)\)
\(V_{h2\left(dktc\right)}=0,2.22,4=4,48\left(l\right)\)
b) \(n_{FeCl2}=\dfrac{0,2.1}{1}=0,2\left(mol\right)\)
⇒ \(m_{FeCl2}=0,2.127=25,4\left(g\right)\)
\(n_{HCl\left(dư\right)}=0,5-\left(0,2.2\right)=0,1\left(mol\right)\)
⇒ \(m_{HCl\left(dư\right)}=0,1.36,5=3,65\left(g\right)\)
\(m_{ddHCl}=1,132.500=566\left(g\right)\)
\(m_{ddspu}=11,2+566-\left(0,2.2\right)=576,8\left(g\right)\)
\(C_{FeCl2}=\dfrac{25,4.100}{576,8}=4,4\)0/0
\(C_{HCl\left(dư\right)}=\dfrac{3,65.100}{576,8}=0,63\)0/0
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