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\(n_{HCl}=0,5.0,2=0,1\left(mol\right)\)
Pt : \(Fe+2HCl\rightarrow FeCl_2+H_2\)
0,05<--0,1----->0,05--->0,05
\(m_{Fe}=0,05.56=2,8\left(g\right)\)
\(m_{FeCl2}=0,05.127=6,35\left(g\right)\)
\(V_{H2\left(dktc\right)}=0,05.22,4=1,12\left(l\right)\)
\(V_{H2\left(dkc\right)}=0,05.24,79=1,2395\left(l\right)\)
a, \(Fe+2HCl\rightarrow FeCl_2+H_2\)
\(n_{H_2}=\dfrac{3,36}{22,4}=0,15\left(mol\right)\)
Theo PT: \(n_{Fe}=n_{H_2}=0,15\left(mol\right)\Rightarrow m_{Fe}=0,15.56=8,4\left(g\right)\)
\(n_{HCl}=2n_{H_2}=0,3\left(mol\right)\Rightarrow m_{HCl}=0,3.36,5=10,95\left(g\right)\)
b, \(n_{FeCl_2}=n_{H_2}=0,15\left(mol\right)\Rightarrow m_{FeCl_2}=0,15.127=19,05\left(g\right)\)
\(a)Fe+2HCl\rightarrow FeCl_2+H_2\\ b)n_{HCl}=\dfrac{200.18,25\%}{100\%.36,5}=1mol\\ n_{FeCl_2}=n_{H_2}=\dfrac{1}{2}n_{HCl}=1:2=0,5mol\\ m_{FeCl_2}=0,5.127=63,5g\\ c)V_{H_2}=0,5.24,79=12,395l\)
\(C\%_{ddHCl}=\dfrac{m_{HCl}}{m_{ddHCl}}.100\%\)
\(\Leftrightarrow m_{HCl}=\dfrac{C\%_{ddHCl}.m_{ddHCl}}{100\%}\)
\(\Leftrightarrow m_{HCl}=\dfrac{18,25\%.200}{100\%}\)
\(\Rightarrow m_{ddHCl}=36,5g\)
\(n_{HCl}=\dfrac{m}{M}=\dfrac{36,5}{36,5}=1mol\)
PTHH: Fe + 2HCl \(\rightarrow\) FeCl2 + H2
TL: 1 2 1 1
mol: 0,5 \(\leftarrow\) 1 \(\rightarrow\) 0,5 \(\rightarrow\) 0,5
\(a.m_{FeCl_2}=n.M=0,5.127=63,5g\)
\(c.V_{H_2}=n.22,4=0,5.22,4=11,2l\)
Ta có: \(n_{Fe}=\dfrac{11,2}{56}=0,2\left(mol\right)\)
PT: \(Fe+2HCl\rightarrow FeCl_2+H_2\)
a, nFeCl2 = nFe = 0,2 (mol) ⇒ mFeCl2 = 0,2.127 = 25,4 (g)
b, nHCl = 2nFe = 0,4 (mol) ⇒ mHCl = 0,4.36,5 = 14,6 (g)
c, nH2 = nFe = 0,2 (mol) ⇒ VH2 = 0,2.24,79 = 4,958 (l)
d, \(n_{O_2}=\dfrac{3,7185}{24,79}=0,15\left(mol\right)\)
PT: \(2H_2+O_2\underrightarrow{t^o}2H_2O\)
Xét tỉ lệ: \(\dfrac{0,2}{2}< \dfrac{0,15}{1}\), ta được O2 dư.
Theo PT: nH2O = nH2 = 0,2 (mol)
⇒ mH2O = 0,2.18 = 3,6 (g)
\(n_{HCl}=0,1mol\)
\(Fe+2HCl\rightarrow FeCl_2+H_2\)
0,1 0,2 0,1 0,1
\(m_{FeCl_2}=0,1\cdot127=12,7g\)
\(V_{H_2}=0,1\cdot22,4=2,24l\)
\(n_{H_2}=\dfrac{6,72}{22,4}=0,3mol\)
\(Fe+2HCl\rightarrow FeCl_2+H_2\)
0,3 0,6 0,3 ( mol )
\(m_{Fe\left(pứ\right)}=0,3.56=16,8g\)
\(m_{Fe\left(dư\right)}=28-16,8=11,2g\)
\(m_{HCl}=0,6.36,5=21,9g\)
\(n_{H_2}=\dfrac{37,185}{24,79}=1,5mol\\ Fe+2HCl\rightarrow FeCl_2+H_2\\ n_{Fe}=n_{H_2}=1,5mol\\ m_{Fe}=1,5.56=84g\)
PT: \(Fe+2HCl\rightarrow FeCl_2+H_2\)
Ta có: \(n_{H_2}=\dfrac{37,185}{24,79}=1,5\left(mol\right)\)
Theo PT: \(n_{Fe}=n_{H_2}=1,5\left(mol\right)\)
\(\Rightarrow m_{Fe}=1,5.56=84\left(g\right)\)