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\(n_{Fe}=\dfrac{6.72}{56}=0.12\left(mol\right)\)
\(n_{Cl_2}=\dfrac{3.36}{22.4}=0.15\left(mol\right)\)
\(2Fe+3Cl_2\underrightarrow{^{t^0}}2FeCl_3\)
\(0.1........0.15....0.1\)
\(m_{Fe\left(dư\right)}=\left(0.12-0.1\right)\cdot56=1.12\left(g\right)\)
\(m_{FeCl_3}=0.1\cdot162.5=16.25\left(g\right)\)
\(n_{Fe}=\dfrac{11,2}{56}=0,2\left(mol\right)\\ 2Fe+3Cl_2\rightarrow\left(t^o\right)2FeCl_3\\ n_{Cl_2}=\dfrac{3}{2}.0,2=0,3\left(mol\right)\\ n_{FeCl_3}=n_{Fe}=0,2\left(mol\right)\\ a,V_{Cl_2\left(đktc\right)}=0,3.22,4=6,72\left(l\right)\\ b,m_{FeCl_3}=162,5.0,2=32,5\left(g\right)\)
a, \(n_{Fe}=\dfrac{11,2}{56}=0,2\left(mol\right)\)
PT: \(2Fe+3Cl_2\underrightarrow{t^o}2FeCl_3\)
Theo PT: \(n_{Cl_2}=\dfrac{3}{2}n_{Fe}=0,3\left(mol\right)\)
\(\Rightarrow V_{Cl_2}=0,3.22,4=6,72\left(l\right)\)
b, \(n_{FeCl_3}=n_{Fe}=0,2\left(mol\right)\Rightarrow m_{FeCl_3}=0,2.162,5=32,5\left(g\right)\)
nFe=\(\dfrac{2,8}{56}\)=0,05mo
PTHH 2Fe + 3Cl2 - > 2FeCl3
TheoPT 2mol 3mol 2mol
Theo bài 0,05mol 0,075mol 0,05mol
VCl2=0,075.22,4=1,68l
mFeCl3=0,05.162,5=8,125g
\(n_{Fe}=\dfrac{2,8}{56}=0,05\left(mol\right)\)
a) 2Fe + 3Cl2 → 2FeCl3
mol 0,05 → 0,075 0,05
b) \(V_{Cl_2\left(đktc\right)}=0,075.22,4=1,68\left(l\right)\)
c) \(m_{FeCl_3}=0,05.162,5=8,125\left(g\right)\)
BT1 :
Bảo toàn khối lượng :
\(m_{FeCl_3}=m_{Fe}+m_{Cl_2}=11.2+21.3=32.5\left(g\right)\)
\(Fe+\dfrac{3}{2}Cl_2\underrightarrow{^{^{t^0}}}FeCl_3\)
\(1.5.....2.25......1.5\)
\(n_{Fe}=\dfrac{9\cdot10^{23}}{6\cdot10^{23}}=1.5\left(mol\right)\)
Số phân tử Cl2 : \(2.25\cdot6\cdot10^{23}=13.5\cdot10^{23}\left(pt\right)\)
Số phân tử FeCl3 : \(1.5\cdot6\cdot10^{23}=9\cdot10^{23}\left(pt\right)\)
a, \(3Fe+2O_2\underrightarrow{t^o}Fe_3O_4\)
b, Ta có: \(n_{Fe}=\dfrac{50,4}{56}=0,9\left(mol\right)\)
Theo PT: \(n_{O_2}=\dfrac{2}{3}n_{Fe}=0,6\left(mol\right)\Rightarrow V_{O_2}=0,6.22,4=13,44\left(l\right)\)
c, \(n_{Fe_3O_4}=\dfrac{1}{3}n_{Fe}=0,3\left(mol\right)\Rightarrow m_{Fe_3O_4}=0,3.232=69,6\left(g\right)\)
d, \(2KClO_3\underrightarrow{t^o}2KCl+3O_2\)
Theo PT: \(n_{KClO_3}=\dfrac{2}{3}n_{O_2}=0,4\left(mol\right)\Rightarrow m_{KClO_3}=0,4.122,5=49\left(g\right)\)
\(n_{Fe}=\dfrac{m}{M}=\dfrac{50,4}{56}=0,9\left(mol\right)\)
\(a.PTHH:3Fe+2O_2\underrightarrow{t^o}Fe_3O_4\)
3 2 1
0,9 0,6 0,3
\(b.V_{O_2}=n.24,79=0,6.24,79=14,874\left(l\right)\)
\(c.m_{Fe_3O_4}=n.M=0,3.\left(56.3+16.4\right)=69,6\left(g\right)\)
\(d.V_{O_2}=14,874\left(l\right)\\ \Rightarrow n_{O_2}=\dfrac{V}{24,79}=\dfrac{14,874}{24,79}=0,6\left(mol\right)\\ PTHH:2KClO_3\underrightarrow{t^o}2KCl+3O_2\)
2 2 3
0,6 0,6 0,9
\(m_{KClO_3}=n.M=0,6.\left(39+35,5+16.3\right)=55,5\left(g\right).\)
\(n_{Fe}=\dfrac{5.6}{56}=0.1\left(mol\right)\)
\(Fe+\dfrac{3}{2}Cl_2\underrightarrow{^{^{t^0}}}FeCl_3\)
\(0.1.......0.15..........0.1\)
\(V_{Cl_2}=0.15\cdot22.4=3.36\left(l\right)\)
\(m_{FeCl_3}=0.1\cdot162.5=16.25\left(g\right)\)
nFe = 33,6 : 56 = 0,6 (mol)
pthh : 3Fe + 2O2 -t--> Fe3O4
0,6--> 0,4------->0,2 (mol)
=> vO2 = 0,4.22,4 = 8,96 (mol)
=> mFe3O4 = 0,2.232 = 46,4 (g)
pthh : 2KClO3 -t--> 2KClO3 + 3O2
0,267<-----------------------0,4(mol)
mKClO3= 0,267 .122,5 = 32,67 (g)
a) PTHH là : 2Fe + 3Cl2 → 2FeCl3
b) số mol Fe là:
nFe = 2,8\56=0,05(mol)
pthh : 2Fe + 3Cl2 → 2FeCl3
0,05mol→0,075mol→0,05mol
thể tích Cl2 là :
VCl2 = 0,075. 22,4 = 1,68 l
c) khối lượng FeCl3 là :
mFeCl3 = 0,05 .162,5,= 8,125 g