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Từ pt (1), n H 2 = n C u = 0,05 mol,
Từ pt (2), n H 2 = 3 . n F e 2 O 3 = 3. 0,075 = 0,225 mol
Tổng thể tích khí H 2 tham gia phản ứng:
V H 2 =(0,05 + ,225).22,4 = 6,16(lit)
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) \(V_{H_2}=\left(0,1+0,225\right).22,4=7,28\left(l\right)\)
Ta có:
\(\left\{{}\begin{matrix}m_{CuO}=\frac{24.33,34}{100}=8\left(g\right)\\n_{Cu}=\frac{8}{80}=0,1\left(mol\right)\end{matrix}\right.\)
\(\left\{{}\begin{matrix}m_{Fe2O3}=24-8=16\left(g\right)\\n_{Fe2O3}=\frac{16}{160}=0,1\left(mol\right)\end{matrix}\right.\)
\(CuO+H_2\rightarrow Cu+H_2O\)
0,1_____________0,1_________
\(m_{Cu}=0,1.64=6,4\left(g\right)\)
\(Fe_2O_3+3H_2\rightarrow2Fe+3H_2O\)
0,1____________0,2____________
\(\Rightarrow m_{Fe}=0,2.56=11,2\left(g\right)\)
\(m_{Fe_2O_3}=16\cdot75\%=12\left(g\right)\)
\(n_{Fe_2O_3}=\dfrac{12}{160}=0.075\left(mol\right)\)
\(n_{CuO}=16\cdot25\%=4\left(g\right)\)
\(n_{CuO}=\dfrac{4}{80}=0.05\left(mol\right)\)
\(Fe_2O_3+3H_2\underrightarrow{^{^{t^0}}}2Fe+3H_2O\)
\(CuO+H_2\underrightarrow{^{^{t^0}}}Cu+H_2O\)
\(n_{H_2}=3\cdot0.075+0.05=0.275\left(mol\right)\)
a,\(m_{Fe_2O_3}=16.75\%=12\left(g\right)\Rightarrow n_{Fe_2O_3}=\dfrac{12}{160}=0,075\left(mol\right)\)
\(m_{CuO}=16-12=4\left(g\right)\Rightarrow n_{CuO}=\dfrac{4}{80}=0,05\left(mol\right)\)
PTHH: Fe2O3 + 3H2 → 2Fe + 3H2O
Mol: 0,075 0,225 0,15
PTHH: CuO + H2 → Cu + H2O
Mol: 0,05 0,05 0,05
\(\Rightarrow m_{Fe}=0,15.56=8,4\left(g\right);m_{Cu}=0,05.64=3,2\left(g\right)\)
b,\(n_{H_2}=0,225+0,05=0,275\left(mol\right)\)
a, PT: \(CuO+H_2\underrightarrow{t^o}Cu+H_2O\)
\(Fe_2O_3+3H_2\underrightarrow{t^o}2Fe+3H_2O\)
b, Ta có: \(m_{Fe_2O_3}=50.80\%=40\left(g\right)\Rightarrow n_{Fe_2O_3}=\dfrac{40}{160}=0,25\left(mol\right)\)
\(\Rightarrow m_{CuO}=10\left(g\right)\Rightarrow n_{CuO}=\dfrac{10}{80}=0,125\left(mol\right)\)
Theo PT: \(\left\{{}\begin{matrix}n_{Cu}=n_{CuO}=0,125\left(mol\right)\\n_{Fe}=2n_{Fe_2O_3}=0,5\left(mol\right)\end{matrix}\right.\)
\(\Rightarrow\left\{{}\begin{matrix}m_{Cu}=0,125.64=8\left(g\right)\\m_{Fe}=0,5.56=28\left(g\right)\end{matrix}\right.\)
b, Theo PT: \(n_{H_2}=n_{CuO}+3n_{Fe_2O_3}=0,875\left(mol\right)\)
\(\Rightarrow V_{H_2}=0,875.22,4=19,6\left(l\right)\)
Bạn tham khảo nhé!
\(a) CuO + H_2 \xrightarrow{t^o} Cu + H_2O\\ Fe_2O_3 + 3H_2 \xrightarrow{t^o} 2Fe + 3H_2O\\ b) n_{CuO} = \dfrac{32.25\%}{80} = 0,1(mol)\\ n_{Fe_2O_3} = \dfrac{32-0,1.80}{160} = 0,15(mol)\\ n_{Cu} = n_{CuO} = 0,1(mol) \Rightarrow m_{Cu} = 0,1.64 = 6,4(gam)\\ n_{Fe} = 2n_{Fe_2O_3} = 0,3(mol) \Rightarrow m_{Fe} = 0,3.56 = 16,8(gam)\)
hỗn hợp 100% <=> 16g
1. fe2o3 75% <=> 12g <=> 0,075mol
cuo 25% <=> 4g <=> 0,1 mol
Ta có:
Fe2O3 + 3H2 --> 2Fe + 3H2O
mol: 0,075 0,225 0,15
CuO + H2 → Cu + H20
mol: 0.1 0.1 0.1
mFe= 0,15x56=8,4g. mCu=0,1x64= 6,4g
nH2= 0,225+0,1=0,325mol ==> V H2 = 0,325x 22,4 = 7,28 lít
PTHH của phản ứng là:
Từ pt (1), ta có: n C u = n C u O = 0,05 mol
m C u = 0,05.64 = 3,2(g)
Từ pt (2), ta có n F e = 2 . n F e 2 O 3 = 2. 0,075 = 0,15 mol
m F e = 0,15.56 = 8,4(g)