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10.
\(n_{Fe}=\dfrac{16.8}{56}=0.3\left(mol\right)\)
\(4Fe+3O_2\underrightarrow{^{^{t^0}}}2Fe_2O_3\)
\(0.3.....0.225....0.15\)
\(V_{O_2}=0.225\cdot22.4=5.04\left(l\right)\)
\(Fe_2O_3+3H_2SO_4\rightarrow Fe_2\left(SO_4\right)_3+3H_2O\)
\(0.15...........0.45\)
\(m_{H_2SO_4}=0.45\cdot98=44.1\left(g\right)\)
11.
\(n_{Fe_2O_3}=\dfrac{48}{160}=0.3\left(mol\right)\)
\(Fe_2O_3+6HCl\rightarrow2FeCl_3+3H_2O\)
\(0.3...........1.8...........0.6\)
\(m_{FeCl_3}=0.6\cdot162.5=97.5\left(g\right)\)
\(m_{HCl}=1.8\cdot36.5=65.7\left(g\right)\)
Bài 10:
\(a,n_{Fe}=\dfrac{16,8}{56}=0,3(mol)\\ PTHH:4Fe+3O_2\xrightarrow{t^o}2Fe_2O_3\\ Fe_2O_3+3H_2SO_4\to Fe_2(SO_4)_3+3H_2O\\ \Rightarrow n_{O_2}=\dfrac{3}{4}n_{Fe}=0,225(mol)\\ \Rightarrow V_{O_2}=0,225.22,4=5,04(l)\\ b,n_{H_2SO_4}=3n_{Fe_2O_3}=3.\dfrac{1}{2}n_{Fe}=0,45(mol)\\ \Rightarrow m_{H_2SO_4}=0,45.98=44,1(g)\)
Bài 11:
\(a,n_{Fe_2O_3}=\dfrac{48}{160}=0,3(mol)\\ PTHH:Fe_2O_3+6HCl\to 2FeCl_3+3H_2O\\ \Rightarrow n_{FeCl_3}=2n_{Fe_2O_3}=0,6(mol)\\ \Rightarrow m_{FeCl_3}=0,6.162,5=97,5(g)\\ b,n_{HCl}=6n_{Fe_2O_3}=1,8(mol)\\ \Rightarrow m_{HCl}=1,8.36,5=65,7(g)\)
\(4Al+3O_2\rightarrow\left(t^o\right)Al_2O_3\\ Al_2O_3+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2O\\ a,n_{Al}=\dfrac{8,1}{27}=0,3\left(mol\right)\\ n_{O_2}=\dfrac{3}{4}.0,3=0,225\left(mol\right)\\ V_{O_2\left(\text{đ}ktc\right)}=0,225.22,4=5,04\left(l\right)\\ b,n_{Al_2O_3}=\dfrac{1}{4}.0,3=0,075\left(mol\right)\\ n_{H_2SO_4}=3.0,075=0,225\left(mol\right)\\ m_{H_2SO_4}=m=0,225.98=22,05\left(g\right)\)
a) PTHH: \(4Fe+3O_2\underrightarrow{t^o}2Fe_2O_3\)
Ta có: \(n_{Fe}=\dfrac{m}{M}=\dfrac{16,8}{56}=0,3\left(mol\right)\)
PTPƯ: 4Fe + 3O2 \(\underrightarrow{t^o}\) 2Fe2O3
4 3 2
0,3 0,225 0,15
\(\Rightarrow V_{O_2}=n.24,79=0,225.24,79=5,57775\left(l\right)\)
a) \(n_{Fe}=\dfrac{16,8}{56}=0,3\left(mol\right)\)
PTHH: \(3Fe+2O_2\xrightarrow[]{t^o}Fe_3O_4\)
0,3--->0,2----->0,1
\(\Rightarrow m_{Fe_3O_4}=0,1.232=23,2\left(g\right)\)
b) \(V_{O_2}=0,2.22,4=4,48\left(l\right)\Rightarrow V_{kk}=4,48.5=22,4\left(l\right)\)
c) \(n_{O_2\left(hao,h\text{ụt}\right)}=0,2.10\%=0,02\left(mol\right)\)
\(\Rightarrow n_{O_2\left(t\text{ổng}\right)}=0,2+0,02=0,22\left(mol\right)\)
PTHH: \(2KMnO_4\xrightarrow[]{t^o}K_2MnO_4+MnO_2+O_2\)
0,44<------------------------------------0,22
\(\Rightarrow m_{KMnO_4}=0,44.158=69,52\left(g\right)\)
a.\(n_{KMnO_4}=\dfrac{m_{KMnO_4}}{M_{KMnO_4}}=\dfrac{3,16}{158}=0,02mol\)
\(2KMnO_4\rightarrow\left(t^o\right)K_2MnO_4+MnO_2+O_2\)
0,02 0,01 ( mol )
\(V_{O_2}=n_{O_2}.22,4=0,01.22,4=0,224l\)
b.
\(4Al+3O_2\rightarrow\left(t^o\right)2Al_2O_3\)
1/75 0,01 1/150 ( mol )
\(m_{Al}=n_{Al}.M_{Al}=\dfrac{1}{75}.27=0,36g\)
\(m_{Al_2O_3}=n_{Al_2O_3}.M_{Al_2O_3}=\dfrac{1}{150}.102=0,68g\)
2KMnO4-to>K2MnO4+MnO2+O2
0,02-------------------------------------0,01
4Al+3O2-to->2Al2O3
\(\dfrac{1}{75}\)---0,01---------\(\dfrac{1}{150}\)
n KMnO4=\(\dfrac{3,16}{158}\)=0,02 mol
=>VO2=0,01.22,4=0,224 l
b)m Al=\(\dfrac{1}{75}\).27=0,36g
=>m Al2O3=\(\dfrac{1}{150}\)102=0,68g
a.b.c.
\(n_{H_2}=\dfrac{V}{22,4}=\dfrac{5,6}{22,4}=0,25mol\)
\(2H_2+O_2\rightarrow\left(t^o\right)2H_2O\)
0,25 0,125 0,25 ( mol )
\(V_{O_2}=n.22,4=0,125.22,4=2,8l\)
\(m_{H_2O}=n.M=0,25.18=4,5g\)
d.
\(S+O_2\rightarrow\left(t^o\right)SO_2\)
0,125 0,125 ( mol )
\(V_{SO_2}=n.22,4=0,125.22,4=2,8l\)
a) \(n_{Al}=\dfrac{8,1}{27}=0,3\left(mol\right)\)
PTHH: 2Al + 3H2SO4 --> Al2(SO4)3 + 3H2
0,3------------------>0,15----->0,45
=> \(m_{Al_2\left(SO_4\right)_3}=0,15.342=51,3\left(g\right)\)
b)
PTHH: 2H2 + O2 --to-->2H2O
0,45->0,225
=> \(V_{O_2}=0,225.22,4=5,04\left(l\right)\)
=> Vkk = 5,04 : 20% = 25,2 (l)
\(4Fe+3O_2\)➞2\(Fe_2O_3\)
4 : 3 : 2
0,3 0,225 0,15
\(n_{Fe}=\frac{m}{M}=\frac{16,8}{56}=0,3\left(mol\right)\)
➞\(m_{O_2}=n.M=0,225.32=7,2\left(g\right)\)
\(Fe_2O_3+3H_2SO_4\)➞ \(Fe_2\left(SO_4\right)_3+3H_2O\)
1 3 1 3
0,3 0,9 0,3 0,9
➞\(m_{H_2SO_4}=n.M=0,9.98=88,2\left(g\right)\)
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