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Cu + H2O
a. PTHH: CuO + H2 ---to---> Cu + H2O (1)
Fe2O3 + 3H2 ---to---> 2Fe + 3H2O (2)
Ta có: \(m_{hh}=62,4\left(g\right)\)
=> \(m_{Fe}=62,4-12,8=49,6\left(g\right)\)
b. Theo PT(1): \(n_{H_2}=n_{Cu}=\dfrac{12,8}{64}=0,2\left(mol\right)\)
Theo PT(2):\(n_{H_2}=3.n_{Fe}=3.\dfrac{49,6}{56}\approx2,7\left(mol\right)\)
=> \(n_{H_{2_{\left(2PT\right)}}}=0,2+2,7=2,9\left(mol\right)\)
=> \(V_{H_2}=2,9.22,4=64,96\left(lít\right)\)
PTHH:
4H2+Fe3O4----->3Fe+4H2O
nH2=V/22,4=6,72/22,4=0,3mol
Theo PTHH:4molH2--->3molFe 0,3molH2->0,3.3/4=0,225molFe
mFe=nFe.M=0,225.56=12,6g
nO= nH2O= nH2= 0,3(mol)
m=m(oxit) - mO= 24- 0,3.16= 19,2(g)
Theo gt ta có: $n_{Fe_3O_4}=0,05(mol)$
$Fe_3O_4+4H_2\rightarrow 3Fe+4H_2O$
Ta có: $n_{H_2}=0,05.4=0,2(mol)\Rightarrow V_{H_2}=4,48(l)$
Ta có :
\(\dfrac{m_{FeO}}{m_{Fe_2O_3}}=\dfrac{9}{20}\Rightarrow\dfrac{72n_{FeO}}{160n_{Fe_2O_3}}=\dfrac{9}{20}\Rightarrow\dfrac{n_{FeO}}{n_{Fe_2O_3}}=\dfrac{9}{20}:\dfrac{72}{160}=1\)
Do đó, ta coi X chỉ gồm $Fe_3O_4$
$n_{Fe} = \dfrac{29,4}{56}= 0,525(mol)$
\(Fe_3O_4+4H_2\xrightarrow[]{t^o}3Fe+4H_2O\)
0,175 0,7 0,525 (mol)
$V = (0,7 : 80\%).22,4 = 19,6(lít)$
$m = (0,175 :80\%).232 = 50,75(gam)$
Ta có: \(n_{Fe}=\dfrac{8,4}{56}=0,15\left(mol\right)\)
\(pthh:3Fe+2O_2\overset{t^o}{--->}Fe_3O_4\)
0,15 -> 0,1 -------> 0,05 (mol)
\(\Rightarrow\left\{{}\begin{matrix}V_{O_2}=0,1.22,4=2,24\left(lít\right)\\m_{Fe_3O_4}=0,05.232=11,6\left(g\right)\end{matrix}\right.\)
\(3Fe+2O_2\rightarrow\left(t^o\right)Fe_3O_4\\ n_{Fe}=\dfrac{8,4}{56}=0,15\left(mol\right)\\ n_{O_2}=\dfrac{2.n_{Fe}}{3}=\dfrac{2.0,15}{3}=0,1\left(mol\right)\\ n_{Fe_3O_4}=\dfrac{n_{Fe}}{3}=\dfrac{0,15}{3}=0,05\left(mol\right)\\ \Rightarrow x=22,4.0,1=2,24\left(l\right)\\ y=232.0,05=11,6\left(g\right)\)
$n_{CO} = 0,45(mol) ; n_{Fe_3O_4} = 0,15(mol)$
$Fe_3O_4 + 4CO \xrightarrow{t^o} 3Fe + 4CO_2$
Ta thấy :
$n_{Fe_3O_4} : 1 = 0,15 > n_{CO} : 4$ nên $Fe_3O_4$ dư
Ta có : $n_{CO_2} = n_{CO} = 0,45(mol)$
Bảo toàn khối lượng : $a = 34,8 + 0,45.28 - 0,45.44 = 27,6(gam)$
bai 1 :
\(n_{Fe}=\dfrac{16,8}{56}=0,3\left(mol\right)\)
Pt : \(4H_2+Fe_3O_4\rightarrow3Fe+4H_2O|\)
4 1 3 4
0,4 0,1 0,3
\(n_{H2}=\dfrac{0,3.4}{3}=0,4\left(mol\right)\)
\(V_{H2\left(dktc\right)}=0,4.22,4=8,96\left(l\right)\)
\(n_{Fe3O4}=\dfrac{0,4.1}{4}=0,1\left(mol\right)\)
⇒ \(m_{Fe3O4}=0,1.232=23,2\left(g\right)\)
Chuc ban hoc tot
Minh xin loi ban nhe , ban bo sung nhiet do len phuong trinh giup minh