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\(a,n_{Fe}=\dfrac{2,52}{56}=0,45\left(mol\right)\\ PTHH:3Fe+2O_2\underrightarrow{t^o}Fe_3O_4\\ \left(mol\right)....0,45\rightarrow0,3...0,15\\ b,V_{O_2}=0,3.22,4=6,72\left(l\right)\\ c,PTHH:2KClO_3\underrightarrow{t^o}2KCl+3O_2\\ \left(mol\right).......0,2\leftarrow............0,3\\ m_{KClO_3}=0,2.122,5=24,5\left(g\right)\)
a) 3Fe + 2O2 -> Fe3O4 ( cần thêm đk nhiệt độ ở mũi tên )
b) nFe= 25,2/56=0,45(mol)
nO2= 2/3 . nFe = 2/3 . 0,45 = 0,3 ( mol )
-> VO2 = 0,3.22,4= 6,72(lít )
c) 2KClO3 -> 2KCl + 3O2 ( cần đk nhiệt độ )
nO2 = 0,3 ( mol )
nKClO3 = 2/3 . nO2 = 2/3 . 0,3 = 0,2 ( mol)
mKClO3= 0,2 . 122,5 = 24,5(g)
\(n_{Fe}=\dfrac{25,2}{56}=0,45\left(mol\right)\\ a,PTHH:3Fe+2O_2\rightarrow\left(t^o\right)Fe_3O_4\\ b,n_{O_2}=\dfrac{2}{3}.0,45=0,3\left(mol\right)\\ \Rightarrow V_{O_2\left(đktc\right)}=0,3.22,4=6,72\left(l\right)\\ c,2KClO_3\rightarrow\left(t^o\right)2KCl+3O_2\\ n_{KClO_3}=\dfrac{2}{3}.0,3=0,2\left(mol\right)\\ \Rightarrow m_{KClO_3}=122,5.0,2=24,5\left(g\right)\)
\(n_{Fe}=\dfrac{126}{56}=2,25\left(mol\right)\\
pthh:3Fe+2O_2\underrightarrow{t^o}Fe_3O_4\)
2,25 1,5
=> \(V_{O_2}=1,5.22,4=33,6\left(L\right)\)
\(PTHH:2KClO_3\underrightarrow{t^o}2KCl+3O_2\)
1 1,5
=> \(m_{KClO3}=122,5\left(g\right)\)
a. \(n_{Fe}=\dfrac{11.2}{56}=0,2\left(mol\right)\)
PTHH : 3Fe + 2O2 ---to---> Fe3O4
0,2 \(\dfrac{0.4}{3}\)
b. \(V_{O_2}=\dfrac{0.4}{3}.22,4=\dfrac{8.96}{3}\left(l\right)\)
c. PTHH : 2KClO3 -> 2KCl + 3O2
\(\dfrac{0.8}{3}\) \(\dfrac{0.4}{3}\)
\(m_{KClO_3}=\dfrac{0.8}{3}.122,5=\dfrac{98}{3}\left(g\right)\)
3Fe+2O2-to>Fe3O4
0,225--0,15
n Fe=\(\dfrac{12,6}{56}\)=0,225 mol
VO2=0,15.22,4=3,36l
2KClO3-to>2KCl+3O2
0,1---------------------0,15
=>m KClO3=0,1.122,5=12,25g
\(a,3Fe+2O_2\rightarrow Fe_3O_4\)
\(b,\)
Ta có : \(n_{Fe}=\dfrac{m}{M}=\dfrac{126}{56}=2,25\left(mol\right)\)
\(\Rightarrow n_{O_2}=\dfrac{2}{3}n_{Fe}=\dfrac{2}{3}.2,25=1,5\left(mol\right)\)
\(\Rightarrow VO_2=33,6\left(l\right)\)
\(c,\)
\(PTHH:2KClO_3\rightarrow2KCl+3O_2\)
Theo \(PTHH:n_{KClO_3}=\dfrac{2}{3}n_{O_2}=\dfrac{2}{3}.1,5=1\left(mol\right)\)
\(\Rightarrow m_{KClO_3}=n.M=1,122,5=122,5\left(g\right)\)
\(3Fe+2O_2\underrightarrow{t^o}Fe_3O_4\)
\(n_{Fe}=\dfrac{5,6}{56}=0,1mol\)
Theo pt: \(n_{O_2}=\dfrac{2}{3}n_{Fe}=\dfrac{2}{3}\cdot0,1=\dfrac{1}{15}mol\)
\(\Rightarrow V_{O_2}=\dfrac{1}{15}\cdot22,4=1,5l\)
Cũng theo pt: \(n_{Fe_3O_4}=\dfrac{1}{3}\cdot0,1=\dfrac{1}{30}mol\)
\(\Rightarrow m_{Fe_3O_4}=\dfrac{1}{30}\cdot232=7,73g\)
nFe = 11.2/56=0.2 (mol)
3Fe + 2O2 -to-> Fe3O4
0.2____2/15____1/15
VO2 = 2/15 * 22.4 = 2.9867 (l)
mFe3O4 = 1/15 * 232 = 15.47 (g)
ta có pthh: 3Fe + 2O2 → Fe3O4
Ta có nFe=\(\dfrac{m}{M}\)=\(\dfrac{11,2}{56}\)=0,2(mol)
nO2=2nFe=2*\(\dfrac{0,2}{3}\)=\(\dfrac{2}{15}\)(mol)
VO2=n*M=16*\(\dfrac{2}{15}\)=2,13(l)
nFe3O4=\(\dfrac{0,2}{2}\)=0,1(mol)
mFe3O4=\(\dfrac{0,1}{168+64}\)=23,2(g)
\(n_{Fe}=\dfrac{22,4}{56}=0,4\left(mol\right)\)
\(PTHH:3Fe+2O_2\underrightarrow{t^o}Fe_3O_4\\ Mol:0,4\rightarrow\dfrac{4}{15}\rightarrow\dfrac{2}{15}\)
\(\rightarrow\left\{{}\begin{matrix}V_{O_2}=\dfrac{4}{15}.22,4=\dfrac{448}{75}\left(l\right)\rightarrow V_{kk}=\dfrac{448}{75}.5=\dfrac{448}{15}\left(l\right)\\m_{Fe_3O_4}=\dfrac{2}{15}.232=\dfrac{464}{15}\left(g\right)\end{matrix}\right.\)
2KClO3 --to--> 2KCl + 3O2
\(\dfrac{8}{45}\) \(\dfrac{4}{15}\)
\(m_{KClO_3}=\dfrac{8}{45}.122,5=\dfrac{196}{9}\left(g\right)\)
a, \(n_{Fe}=\dfrac{22,4}{56}=0,4\left(mol\right)\)
PTHH: 3Fe + 2O2 ---to---> Fe3O4
Mol: 0,4 \(\dfrac{0,8}{3}\) \(\dfrac{0,4}{3}\)
b, \(V_{O_2}=\dfrac{0,8}{3}.22,4=5,973\left(l\right)\)
c, \(V_{kk}=\dfrac{448}{75}.5=29,867\left(l\right)\)
d, \(m_{Fe_3O_4}=\dfrac{0,4}{3}.232=30,93\left(g\right)\)
e,
PTHH: 2KClO3 ---to---> 2KCl + 3O2
Mol: \(\dfrac{0,16}{9}\) \(\dfrac{0,8}{3}\)
\(m_{KClO_3}=\dfrac{0,16}{9}.122,5=2,178\left(g\right)\)
a) 3Fe + 2O2 --to--> Fe3O4
b) \(n_{Fe}=\dfrac{126}{56}=2,25\left(mol\right)\)
PTHH: 3Fe + 2O2 --to--> Fe3O4
2,25--->1,5
=> VO2 = 1,5.22,4 = 33,6 (l)
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