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Gọi \(n_{Fe_2O_3}=a\left(mol\right)\Rightarrow n_{CuO}=3a\left(mol\right)\)
Ta có: \(m_{hh}=160a+80.3a=400a\left(g\right)\)
\(\%m_{Fe_2O_3}=\dfrac{160a.100\%}{400a}=40\%\)
\(\%m_{CuO}=100-40=60\%\)
\(n_{CuO}=2a\left(mol\right)\Rightarrow n_{Fe_2O_3}=a\left(mol\right)\)
\(m_X=80\cdot2a+160a=80\left(g\right)\)
\(\Rightarrow a=0.25\left(mol\right)\)
\(CuO+H_2\underrightarrow{^{^{t^0}}}Cu+H_2O\)
\(Fe_2O_3+3H_2\underrightarrow{^{^{t^0}}}2Fe+3H_2O\)
\(n_{H_2}=0.5+0.25\cdot3=1.25\left(mol\right)\)
\(V_{H_2}=1.25\cdot22.4=28\left(l\right)\)
\(m_{cr}=0.5\cdot64+0.5\cdot56=60\left(g\right)\)
a) Gọi số mol H2 là x
=> nH2O=x(mol)
Theo ĐLBTKL: mA+mH2=mB+mH2O
=> 200 + 2x = 156 + 18x
=> x = 2,75 (mol)
=> VH2=2,75.22,4=61,6(l)
b) Gọi nCuO=a(mol)
nFe2O3=1,5a(mol)
=> 80a + 240a + 102b = 200
=> 320a + 102b = 200
PTHH: CuO + H2 --to--> Cu + H2O
a---------------->a
Fe2O3 + 3H2 --to--> 2Fe + 3H2O
1,5a------------------>3a
=> 64a + 168a + 102b = 156
=> 232a + 102b = 156
=> a = 0,5; b = \(\dfrac{20}{15}\)
%mCuO=\(\dfrac{0,5.80}{200}\).100%=20%
%mFe2O3=\(\dfrac{0,75.160}{200}\).100%=60%
%mAl2O3=\(\dfrac{\dfrac{20}{15}102}{200}\).100%=20%
c) nH2=\(\dfrac{2,75}{5}\)=0,55(mol)
nFeO(tt)=\(\dfrac{36}{72}\)=0,5(mol)
Gọi số mol FeO phản ứng là t (mol)
PTHH: FeO + H2 --to--> Fe + H2O
t--------------->t
=> 56t + (0,5-t).72 = 29,6
=> t = 0,4 (mol)
=> H%=\(\dfrac{0,4}{0,5}\).100%=80%
Đặt nFe2O3 = x (mol) ⇒ nCuO = \(\dfrac{1}{2}\)x
1. PTHH:
CuO + H2SO4 → CuSO4 + H2O (1)
1 mol : 1mol : 1 mol : 1 mol
\(\dfrac{1}{2}\)x : \(\dfrac{1}{2}\)x : \(\dfrac{1}{2}\)x : \(\dfrac{1}{2}\)x
Fe2O3 + 3H2SO4 → Fe2(SO4)3 + 3H2O (2)
1 mol : 3 mol : 1 mol : 3 mol
x mol : x mol : x mol : x mol
nH2SO4 = \(\dfrac{68,6}{98}\)= 0,7 (mol)
Theo (1) và (2): nH2SO4 = \(\dfrac{1}{2}\)x + 3x = 0,7 ⇒ x = 0,2 (mol)
⇒ nCuO = \(\dfrac{1}{2}\)x = \(\dfrac{1}{2}\).0,2 = 0,1 (mol)
2. mCuO = n.M = 0,1.80 = 8 (g)
mFe2O3 = n.M = 0,2.160 = 32 (g)
mhh A = mCuO + mFe2O3 = 8 + 32 = 40 (g)
% khối lượng mỗi oxit trong hỗn hợp A lần lượt là:
%mCuO = \(\dfrac{m_{CuO}}{m_{hhA}}\).100% = \(\dfrac{8}{40}\).100% = 20%
%mFe2O3 = 100% - 20% = 80%
Gọi \(\left\{{}\begin{matrix}n_{Fe_2O_3}=a\left(mol\right)\\n_{Al_2O_3}=2a\left(mol\right)\\n_{CuO}=3a\left(mol\right)\end{matrix}\right.\)
PTHH:
Fe2O3 + 3H2 --to--> 2Fe + 3H2O
a ---------> 3a
CuO + H2 --to--> Cu + H2O
3a ------> 3a
\(\rightarrow3a+3a=\dfrac{13,44}{22,4}=0,6\left(mol\right)\\ \Leftrightarrow a=0,1\left(mol\right)\\ \rightarrow m=0,1.160+0,1.2.102+0,1.3.80=60,4\left(g\right)\)
Gọi \(n_{Fe_2O_3}=x\left(mol\right)\)
\(\Rightarrow\left\{{}\begin{matrix}n_{Al_2O_3}=2x\left(mol\right)\\n_{CuO}=3x\left(mol\right)\end{matrix}\right.\)
\(n_{H_2}=\dfrac{13,44}{22,4}=0,6mol\)
\(CuO+H_2\rightarrow Cu+H_2O\)
3x 3x
\(Al_2O_3+3H_2\rightarrow2Al+3H_2O\)
2x 6x
\(Fe_2O_3+3H_2\rightarrow2Fe+3H_2O\)
x 3x
\(\Rightarrow\Sigma n_{H_2}=3x+6x+3x=0,6\Rightarrow x=0,05mol\)
\(\Rightarrow m=m_{CuO}+m_{Al_2O_3}+m_{Fe_2O_3}\)
\(\Rightarrow m=3\cdot0,05\cdot80+2\cdot0,05\cdot102+0,05\cdot160=30,2g\)
\(n_{CuO}=4a\left(mol\right)\Rightarrow n_{FeO}=a\left(mol\right)\)
\(m_X=80\cdot4a+72a=19.6\left(g\right)\)
\(\Rightarrow a=0.05\)
\(CuO+H_2\underrightarrow{^{^{t^0}}}Cu+H_2O\)
\(FeO+H_2\underrightarrow{^{^{t^0}}}Fe+H_2O\)
\(m_{cr}=0.2\cdot64+0.05\cdot56=15.6\left(g\right)\)
\(V_{H_2}=\left(0.05\cdot4+0.05\right)\cdot22.4=5.6\left(l\right)\)
gọi nFe2O3=x => nCuO = 2x
ta có 160x + 80.2x = 32 => x=0,1 => 2x =0,2
=> nCuO= 0,2 nFe2O3 = 0,1