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Cu + H2O
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)
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
\(\left[O\right]_{KL}+H_2->H_2O\\ n_{H_2O}=n_{H_2}=\dfrac{14,4}{18}=0,8mol\\ v=0,8.22,4=17,92L\\ m_{KL}=m=47,2-16.0,8=34,4g\)
CuO+H2-to>Cu+H2O
0,3-------0,3-----0,3
Fe2O3+3H2-tO>2Fe+3H2O
0,3------0,2
n Fe=0,2 mol
n Cu=0,3 mol
=>VH2=0,3.2,22.4=13,44l
nFe = 11,2 : 56 = 0,2 (mol)
nCu = 19,2 : 64 = 0,3 (mol)
pthh Fe2O3 +3H2 -t-> 2Fe + 3H2O
0,3<----0, 2 (mol)
CuO + H2 --t--> Cu +H2O
0,3<------0,3 (mol)
nH2 = 0,3 + 0,3 = 0,6 (mol)
=> VH2 = 0,6 . 22,4 = 13,44 (l)
\(Fe_2O_3+3H_2\rightarrow\left(t^o\right)2Fe+3H_2O\\ CuO+H_2\rightarrow\left(t^o\right)Cu+H_2O\\ Đặt:n_{Fe}=a\left(mol\right);n_{Cu}=0,5a\left(mol\right)\\ m_{hhB}=17,6\\ \Leftrightarrow56a+64.0,5a=17,6\\ \Leftrightarrow a=0,2\left(mol\right)\\ \Rightarrow n_{Fe}=0,2\left(mol\right);n_{Cu}=0,1\left(mol\right)\\ a,n_{H_2}=\dfrac{3}{2}.n_{Fe}+n_{Cu}=\dfrac{3}{2}.0,2+0,1=0,4\left(mol\right)\\ \Rightarrow V_{H_2\left(đktc\right)}=0,4.22,4=8,96\left(l\right)\\ b,Fe+2HCl\rightarrow FeCl_2+H_2\\ n_{HCl}=\dfrac{18,25}{36,5}=0,5\left(mol\right)\\ Vì:\dfrac{0,2}{1}< \dfrac{0,5}{2}\Rightarrow HCldư\\ \Rightarrow ddC:FeCl_2,HCldư\\ n_{FeCl_2}=n_{Fe}=0,2\left(mol\right)\Rightarrow m_{FeCl_2}=0,2.127=25,4\left(g\right)\\ n_{HCl\left(dư\right)}=0,5-0,2.2=0,1\left(mol\right)\)
\(\Rightarrow m_{HCl\left(dư\right)}=0,1.36,5=3,65\left(g\right)\)
a) \(m_{CuO}=\dfrac{20.40}{100}=8\left(g\right)\) => \(n_{CuO}=\dfrac{8}{80}=0,1\left(mol\right)\)
\(m_{Fe_2O_3}=20-8=12\left(g\right)\) => \(n_{Fe_2O_3}=\dfrac{12}{160}=0,075\left(mol\right)\)
PTHH: CuO + H2 --to--> Cu + H2O
0,1--->0,1------>0,1
Fe2O3 + 3H2 --to--> 2Fe + 3H2O
0,075--->0,225----->0,15
=> mCu = 0,1.64 = 6,4 (g)
=> mFe = 0,15.56 = 8,4 (g)
b) \(V_{H_2}=\left(0,1+0,225\right).22,4=7,28\left(l\right)\)
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):\(n_{H_2}=3.n_{Fe}=3.\dfrac{49,6}{56}\approx2,7\left(mol\right)\)
=> \(n_{H_{2_{\left(2PT\right)}}}=0,2+2,7=2,9\left(mol\right)\)
=> \(V_{H_2}=2,9.22,4=64,96\left(lít\right)\)