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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)
4Al + 3O2 --to--> 2Al2O3
2Mg + O2 --to--> 2MgO
b) Gọi số mol Al, Mg là a, b (mol)
=> 27a + 24b = 7,8 (1)
PTHH: 4Al + 3O2 --to--> 2Al2O3
a--->0,75a----->0,5a
2Mg + O2 --to--> 2MgO
b--->0,5b------->b
=> 102.0,5a + 40b = 14,2
=> 51a + 40b = 14,2 (2)
(1)(2) => a = 0,2 (mol); b = 0,1 (mol)
nO2 = 0,75a + 0,5b = 0,2 (mol)
=> VO2 = 0,2.22,4 = 4,48 (l)
=> Vkk = 4,48 : 20% = 22,4 (l)
c)
mAl = 0,2.27 = 5,4 (g)
mMg = 0,1.24 = 2,4 (g)
a)
4Al + 3O2 --to--> 2Al2O3
2Mg + O2 --to--> 2MgO
b) Gọi số mol Al, Mg là a, b (mol)
=> 27a + 24b = 7,8 (1)
PTHH: 4Al + 3O2 --to--> 2Al2O3
a--->0,75a----->0,5a
2Mg + O2 --to--> 2MgO
b--->0,5b------->b
=> 102.0,5a + 40b = 14,2
=> 51a + 40b = 14,2 (2)
(1)(2) => a = 0,2 (mol); b = 0,1 (mol)
nO2 = 0,75a + 0,5b = 0,2 (mol)
=> VO2 = 0,2.22,4 = 4,48 (l)
=> Vkk = 4,48 : 20% = 22,4 (l)
c)
mAl = 0,2.27 = 5,4 (g)
mMg = 0,1.24 = 2,4 (g)
\(n_{CuO}=2a\left(mol\right)\Rightarrow n_{Fe_2O_3}=a\left(mol\right)\)
\(m_X=80\cdot2a+160a=80\left(g\right)\)
\(\Rightarrow a=0.25\left(mol\right)\)
\(CuO+H_2\underrightarrow{^{^{t^0}}}Cu+H_2O\)
\(Fe_2O_3+3H_2\underrightarrow{^{^{t^0}}}2Fe+3H_2O\)
\(n_{H_2}=0.5+0.25\cdot3=1.25\left(mol\right)\)
\(V_{H_2}=1.25\cdot22.4=28\left(l\right)\)
\(m_{cr}=0.5\cdot64+0.5\cdot56=60\left(g\right)\)
Bài 1 :
a)
$Fe_2O_3 + 3H_2 \xrightarrow{t^o} 2F e+ 3H_2O$
$Fe_3O_4 + 4H_2 \xrightarrow{t^o} 3Fe + 4H_2O$
b)
Cách 1 : Gọi $n_{Fe_2O_3} = a ; n_{Fe_3O_4} = b$
Ta có :
$\dfrac{16(3a + 4b)}{160a + 232b}.100\% = 28,205\%$
$n_{H_2} = 3a + 4b = 2,2 : 2 = 1,1$
Suy ra: $a = 0,1 ; b = 0,2$
Suy ra: $m =0,1.160 + 0,2.232 = 62,4(gam)$
Cách 2 :
$n_{O(oxit)} = n_{H_2} = 1,1(mol)$
$m_O = 1,1.16 = 17,6(gam)$
$\Rightarrow m = 17,6 : 28,205\% = 62,4(gam)$
c)
$m_{Fe_2O_3} = 0,1.160 = 16(gam)$
$m_{Fe_3O_4} = 0,2.232 = 46,4(gam)$
d)
$n_{Fe} = 2a + 3b = 0,8(mol)$
$m_{Fe} = 0,8.56 = 44,8(gam)$
\(m_{Fe_2O_3}=\dfrac{80\cdot50}{100}=40\left(g\right)\)
\(m_{CuO}=50-40=10\left(g\right)\)
\(n_{Fe_2O_3}=\dfrac{40}{160}=0.25\left(mol\right)\)
\(n_{CuO}=\dfrac{10}{80}=0.125\left(mol\right)\)
\(Fe_2O_3+3H_2\underrightarrow{t^0}2Fe+3H_2O\)
\(CuO+H_2\underrightarrow{t^0}Cu+H_2O\)
\(n_{H_2}=3\cdot0.25+0.125=0.875\left(mol\right)\)
\(V_{H_2}=0.875\cdot22.4=19.6\left(l\right)\)
Chúc bạn học tốt <3
\(m_{CuO}=50.20\%=10\left(g\right)\)
\(n_{CuO}=\dfrac{10}{80}=0,125\left(mol\right)\)
\(m_{Fe_2O_3}=50-10=40\left(g\right)\)
\(n_{Fe_2O_3}=\dfrac{40}{160}=0,25\left(mol\right)\)
PTHH :
\(CuO+H_2\underrightarrow{t^o}Cu+H_2O\)
0,125 0,125 0,125
\(Fe_2O_3+3H_2\underrightarrow{t^o}2Fe+3H_2O\)
0,25 0,75 0,5
\(a,V_{H_2}=\left(0,75+0,125\right).22,4=19,6\left(l\right)\)
\(b,m_{Cu}=0,125.64=8\left(g\right)\)
\(m_{Fe}=0,5.56=28\left(g\right)\)
Fe2O3+3H2-to>2Fe+3H2O
0,075----0,225
CuO+H2-to>Cu+H2O
0,1-----0,1
b)
m Fe2O3=20.\(\dfrac{60}{100}\)=12g
=>n Fe2O3=\(\dfrac{12}{160}\)=0,075 mol
m CuO=20-12=8g
=>n CuO=\(\dfrac{8}{80}=0,1mol\)
=>VH2=(0,1+0,225).22,4=7,28l