Hóa học 8
Khử hoàn toàn 32g sắt (III) oxit bằng khí H2 dư
a) Viết PTHH xảy ra
b) Xác định thể tích H2 ở đktc đã phản ứng
c) Tính khối lượng kim loại thu được
Mình đang cần gấp ạ. Thanks!
Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
\(n_{Fe}=\dfrac{33.6}{56}=0.6\left(mol\right)\)
\(Fe_2O_3+3H_2\underrightarrow{^{^{t^0}}}2Fe+3H_2O\)
\(0.3..........0.9......0.6\)
\(m_{Fe_2O_3}=0.3\cdot160=48\left(g\right)\)
\(V_{H_2}=0.9\cdot22.4=20.16\left(l\right)\)
nFe=0,2(mol)
a) PTHH: Fe2O3 + 3 H2 -to-> 2 Fe + 3 H2O
0,1_____________0,3____0,2(mol)
b) mFe2O3=160.0,1=16(g)
c) V(H2,đktc)=0,3.22,4=6,72(l)
\(n_{Fe_3O_4}=\dfrac{24}{232}=\dfrac{3}{29}\left(mol\right)\)
PTHH :
\(Fe_3O_4+4H_2\underrightarrow{t^o}3Fe+4H_2O\)
3/29 9/29
\(Fe+2HCl\rightarrow FeCl_2+H_2\uparrow\)
9/29 18/29
\(c,V_{HCl}=\dfrac{\dfrac{18}{29}}{1,5}=\dfrac{12}{29}\left(l\right)\)
a, \(Fe_2O_3+3H_2\underrightarrow{t^o}2Fe+3H_2O\)
b, \(n_{Fe_2O_3}=\dfrac{24}{160}=0,15\left(mol\right)\)
Theo PT: \(n_{H_2}=3n_{Fe_2O_3}=0,45\left(mol\right)\)
\(\Rightarrow V_{H_2}=0,45.22,4=10,08\left(l\right)\)
c, n\(n_{Fe}=2n_{Fe_2O_3}=0,3\left(mol\right)\)
PT: \(Fe+2HCl\rightarrow FeCl_2+H_2\)
Theo PT: \(n_{HCl}=2n_{Fe}=0,6\left(mol\right)\Rightarrow V_{HCl}=\dfrac{0,6}{1,5}=0,4\left(M\right)\)
a, \(Fe_2O_3+3H_2\underrightarrow{t^o}2Fe+3H_2O\)
b, \(n_{Fe}=\dfrac{22,4}{56}=0,4\left(mol\right)\)
Theo PT: \(n_{Fe_2O_3}=\dfrac{1}{2}n_{Fe}=0,2\left(mol\right)\Rightarrow m_{Fe_2O_3}=0,2.160=32\left(g\right)\)
c, \(n_{H_2}=\dfrac{3}{2}n_{Fe}=0,6\left(mol\right)\Rightarrow V_{H_2}=0,6.22,4=13,44\left(l\right)\)
d, \(2H_2+O_2\underrightarrow{t^o}2H_2O\)
Theo PT: \(n_{O_2}=\dfrac{1}{2}n_{H_2}=0,3\left(mol\right)\Rightarrow V_{O_2}=0,3.22,4=6,72\left(l\right)\)
\(\Rightarrow V_{kk}=\dfrac{V_{O_2}}{20\%}=33,6\left(l\right)\)
a)
$Fe_2O_3 + 3H_2 \xrightarrow{t^o} 2Fe + 3H_2O$
b) $n_{Fe} = \dfrac{22,4}{56} = 0,4(mol)$
Theo PTHH : $n_{Fe_2O_3} = \dfrac{1}{2}n_{Fe} = 0,2(mol)$
$m_{Fe_2O_3} = 0,2.160 = 32(gam)$
c) $n_{H_2} = \dfrac{3}{2}n_{Fe} = 0,6(mol)$
$V_{H_2} = 0,6.22,4 = 13,44(lít)$
d) $2H_2 + O_2 \xrightarrow{t^o} 2H_2O$
$V_{O_2} = \dfrac{1}{2}V_{H_2} = 6,72(lít)$
$V_{kk} = 6,72 : 20\% = 33,6(lít)$
\(n_{Fe_2O_3}=\frac{3,2}{160}=0,02\left(mol\right)\)
a, \(Fe_2O_3+3H_2-->2Fe+3H_2O\left(1\right)\)
b, Theo (1), \(n_{H_2}=3n_{Fe_2O_3}=0,06\left(mol\right)\)
=> \(V_{H_2}=0,06.22,4=1,344\left(l\right)\)
c, theo (1) \(n_{Fe}=2n_{Fe_2O_3}=0,04\left(mol\right)\)
=> \(m_{Fe}=0,04.56=2,24\left(g\right)\)
a, \(FeO+H_2\underrightarrow{t^o}Fe+H_2O\)
b, \(n_{FeO}=\dfrac{7,2}{72}=0,1\left(mol\right)\)
\(n_{Fe}=n_{FeO}=0,1\left(mol\right)\Rightarrow m_{Fe}=0,1.56=5,6\left(g\right)\)
c, \(n_{H_2}=n_{FeO}=0,1\left(mol\right)\Rightarrow V_{H_2}=0,1.22,4=2,24\left(l\right)\)
a) \(Fe_2O_3+3H_2\rightarrow2Fe+3H_2O\)
b) \(M_{Fe_2O_3}=56.2+16.3=160\left(g/mol\right)\)
\(\Rightarrow n_{Fe_2O_3}=\frac{m}{M}=\frac{32}{160}=0,2\left(mol\right)\)
\(\Rightarrow n_{H_2}=0,2.3=0,6\left(mol\right)\)
\(\Rightarrow V_{H_2}=22,4.0,6=13,44\left(l\right)\)
c) Vì \(n_{Fe_2O_3}=0,2mol\)\(\Rightarrow n_{Fe}=0,2.2=0,4\left(mol\right)\)
\(\Rightarrow m_{Fe}=56.0,4=22,4\left(g\right)\)