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a.\(n_P=\dfrac{1,55}{31}=0,05\left(mol\right)\)
PTHH : 4P + 5O2 -> 2P2O5
0,05 0,0625 0,025
\(V_{O_2}=0,0625.22,4=1,4\left(l\right)\)
b. \(m_{P_2O_5}=0,025.142=3,55\left(g\right)\)
Ta có: \(n_P=\dfrac{12,4}{31}=0,4\left(mol\right)\)
PT: \(4P+5O_2\underrightarrow{t^o}2P_2O_5\)
_____0,4____0,5_____0,2 (mol)
a, \(m_{P_2O_5}=0,2.142=28,4\left(g\right)\)
b, \(V_{O_2}=0,5.22,4=11,2\left(l\right)\)
\(a,PTHH:2Zn+O_2\underrightarrow{t^o}2ZnO\)
\(2:1:2\left(mol\right)\)
\(0,05:0,025:0,05\left(mol\right)\)
\(n_{Zn}=\dfrac{m}{M}=\dfrac{3,25}{65}=0,05\left(mol\right)\)
\(b,V_{O_2}=n.22,4=0,025.22,4=0,56\left(l\right)\)
\(n_{Al}=\dfrac{0,54}{27}=0,02\left(mol\right)\)
Pt : \(4Al+3O_2\xrightarrow[]{t^o}2Al_2O_3\)
0,02-->0,015-->0,01
a) \(m_{Al2O3}=0,01.102=1,02\left(g\right)\)
b) \(V_{O2\left(dktc\right)}=0,015.24,79=0,37185\left(l\right)\)
sửa lại \(V_{\left(dktc\right)}-->V_{\left(dkc\right)}\)
4P+5O2-to>2P2O5
0,05--0,0625------0,025 mol
n P=\(\dfrac{1,55}{31}\)=0,05 mol
=>VO2=0,0625.22,4=1,4l
=> mP2O5=0,025.142=3,55g
`2KClO_3->2KCl+3O_2`(to)
0,04-----------0,02-----0,06
`n_(KClO_3)=(4,9)/(122,5)=0,04mol`
=>`V_(O_2)=0,06.24,79=1,4847l`
c)
`4P+5O_2->2P_2O_5`(to)
0,048----0,06 mol
`=>m_P=0,048.31=1,488g`
nFe = 16,8/56 = 0,3 (mol)
PTHH: 3Fe + 2O2 -> (t°) Fe3O4
Mol: 0,3 ---> 0,2
VO2 = 0,2 . 22,4 = 4,48 (l)
PTHH: 4P + 5O2 -> (t°) 2P2O5
Mol: 0,16 <--- 0,2
mP = 0,16 . 31 = 4,96 (g)