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\(n_{Fe_2O_3}=\dfrac{16}{160}=0,1\left(mol\right)\)
PTHH: Fe2O3 + 3H2 --to--> 2Fe + 3H2O
0,1 0,3 0,2
\(V_{H_2}=0,3.22,4=6,72\left(l\right)\)
\(n_{O_2}=\dfrac{2,24}{22,4}=0,1\left(mol\right)\)
PTHH: 3Fe + 2O2 --to--> Fe3O4
LTL: \(\dfrac{0,2}{3}>\dfrac{0,1}{2}\rightarrow\) Fe dư
Theo pthh: \(n_{Fe\left(pư\right)}=\dfrac{3}{2}n_{O_2}=\dfrac{3}{2}.0,1=0,15\left(mol\right)\)
\(\rightarrow m_{Fe\left(dư\right)}=\left(0,2-0,15\right).56=2,8\left(g\right)\)
a.\(n_{Fe_2O_3}=\dfrac{16}{160}=0,1mol\)
\(Fe_2O_3+3H_2\rightarrow\left(t^o\right)2Fe+3H_2O\)
0,1 0,3 0,2 ( mol )
\(V_{H_2}=0,3.22,4=6,72l\)
b.\(n_{O_2}=\dfrac{2,24}{22,4}=0,1mol\)
\(3Fe+2O_2\rightarrow\left(t^o\right)Fe_3O_4\)
\(\dfrac{0,2}{3}\) > \(\dfrac{0,1}{2}\) ( mol )
0,15 0,1 ( mol )
Chất dư là Fe
\(m_{Fe\left(dư\right)}=\left(0,2-0,15\right).56=2,8g\)
PT: \(Fe_2O_3+3H_2\underrightarrow{t^o}2Fe+3H_2O\)
Ta có: \(n_{Fe_2O_3}=\dfrac{16}{160}=0,1\left(mol\right)\)
a, \(n_{Fe}=2n_{Fe_2O_3}=0,2\left(mol\right)\)
\(\Rightarrow m_{Fe}=0,2.56=11,2\left(g\right)\)
b, \(n_{H_2}=3n_{Fe_2O_3}=0,3\left(mol\right)\)
\(\Rightarrow V_{H_2}=0,3.22,4=6,72\left(l\right)\)
c, PT: \(Mg+2HCl\rightarrow MgCl_2+H_2\)
Theo PT: \(n_{Mg}=n_{H_2}=0,3\left(mol\right)\)
\(\Rightarrow m_{Mg}=0,3.24=7,2\left(g\right)\)
\(n_{Mg}=\dfrac{6}{24}=0,25\left(mol\right)\\
pthh:Mg+H_2SO_4->MgSO_4+H_2\)
0,25 0,25 0,25 0,25
\(m_{MgSO_4}=0,25.120=30\left(g\right)\)
\(n_{Fe_2O_3}=\dfrac{24}{160}=0,15\left(mol\right)\\
pthh:Fe_2O_3+3H_2\underrightarrow{t^o}2Fe+3H_2O\)
LTL : \(\dfrac{0,15}{1}>\dfrac{0,25}{3}\)
=> Fe dư , H2 hết
=> \(m_{Fe}=\dfrac{1}{6}.56=\approx9,3\left(g\right)\)
\(PTHH:Fe_3O_4+4H_2\rightarrow^{t^o}3Fe+4H_2O\\ n_{Fe}=\dfrac{30,24}{56}=0,54\left(mol\right)\\ \Rightarrow n_{Fe_3O_4}=\dfrac{1}{3}n_{Fe}=0,18\left(mol\right)\\ \Rightarrow m_{Fe_3O_4}=0,18\cdot232=41,76\left(g\right)\)
PT: \(FeO+H_2\underrightarrow{t^o}Fe+H_2O\)
Ta có: \(n_{FeO}=\dfrac{7,2}{72}=0,1\left(mol\right)\)
a, Theo PT: \(n_{Fe}=n_{FeO}=0,1\left(mol\right)\)
\(\Rightarrow m_{Fe}=0,1.56=5,6\left(g\right)\)
b, Theo PT: \(n_{H_2}=n_{FeO}=0,1\left(mol\right)\)
\(\Rightarrow V_{H_2}=0,1.22,4=2,24\left(l\right)\)
c, PT: \(2Al+6HCl\rightarrow2AlCl_3+3H_2\)
THeo PT: \(n_{Al}=\dfrac{2}{3}n_{H_2}=\dfrac{1}{15}\left(mol\right)\)
\(\Rightarrow m_{Al}=\dfrac{1}{15}.27=1,8\left(g\right)\)
\(Fe_2O_3+3H_2\underrightarrow{t^o}2Fe+3H_2O\)
0,05 0,1 0,15
\(n_{Fe}=\dfrac{5,6}{56}=0,1\left(mol\right)\)
\(a,m_{Fe_2O_3}=0,05.8\left(g\right)\)
\(b,H_2SO_4+Fe\rightarrow FeSO_4+H_2\uparrow\)
0,15 0,15 0,15
\(m_{ddH_2SO_4}=\dfrac{0,15.98.100}{50}=29,4\left(g\right)\)
\(m_{Fe}=\dfrac{0,15.56.100}{50}=16,8\left(g\right)\)