Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
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 \(PTHH:n_{KClO_3}=\dfrac{2}{3}n_{O_2}=\dfrac{2}{3}.1,5=1\left(mol\right)\)
\(\Rightarrow m_{KClO_3}=n.M=1,122,5=122,5\left(g\right)\)
a) PTHH: \(Zn+\dfrac{1}{2}O_2\xrightarrow[]{t^o}ZnO\)
b) Ta có: \(n_{Zn}=\dfrac{19,5}{65}=0,3\left(mol\right)\) \(\Rightarrow n_{O_2}=0,15\left(mol\right)\)
\(\Rightarrow V_{O_2}=0,15\cdot22,4=3,36\left(l\right)\)
c) PTHH: \(KClO_3\xrightarrow[MnO_2]{t^o}KCl+\dfrac{3}{2}O_2\uparrow\)
Theo PTHH: \(n_{KClO_3}=0,1\left(mol\right)\) \(\Rightarrow m_{KClO_3}=0,1\cdot122,5=12,25\left(g\right)\)
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
\(\dfrac{0.8}{3}\) \(\dfrac{0.4}{3}\)
\(m_{KClO_3}=\dfrac{0.8}{3}.122,5=\dfrac{98}{3}\left(g\right)\)
a, PT: \(2Mg+O_2\underrightarrow{t^o}2MgO\)
b, Ta có: \(n_{MgO}=\dfrac{2,4}{40}=0,06\left(mol\right)\)
Theo PT: \(n_{O_2}=\dfrac{1}{2}n_{MgO}=0,03\left(mol\right)\)
\(\Rightarrow V_{O_2}=0,03.22,4=0,672\left(l\right)\)
c, PT: \(2KClO_3\underrightarrow{t^o}2KCl+3O_2\)
Theo PT: \(n_{KClO_3}=\dfrac{2}{3}n_{O_2}=0,02\left(mol\right)\)
\(\Rightarrow m_{KClO_3}=0,02.122,5=2,45\left(g\right)\)
\(n_{Al}=\dfrac{5.4}{27}=0,2mol\)
\(4Al+3O_2\underrightarrow{t^o}2Al_2O_3\)
0,2 0,15 0,1
a)\(V_{O_2}=0,15\cdot22,4=3,36l\)
b)\(n_{O_2}=0,15\cdot10\%=0,015mol\)
\(2KMnO_4\underrightarrow{t^o}K_2MnO_4+MnO_2+O_2\)
0,03 0,015
\(m_{KMnO_4}=0,03\cdot158=4,74g\)
a, nZn = 13/65 = 0,2 (mol)
PTHH: 2Zn + O2 -> (t°) 2ZnO
Mol: 0,2 ---> 0,1 ---> 0,2
b, VO2 = 0,1 . 22,4 = 2,24 (l)
c, mZnO = 0,2 . 81 = 16,2 (g)
d, PTHH: 2KMnO4 -> (t°) K2MnO4 + MnO2 + O2
nKMnO4 = 0,1 . 2 = 0,2 (mol)
mKMnO4 = 0,2 . 158 = 31,6 (g)
\(n_{Fe}=\dfrac{126}{56}=2,25\left(mol\right)\\
pthh:3Fe+2O_2\underrightarrow{t^o}Fe_3O_4\)
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, \(2KMnO_4\underrightarrow{t^o}K_2MnO_4+MnO_2+O_2\)
\(n_{KMnO_4}=\dfrac{15,8}{158}=0,1\left(mol\right)\)
\(n_{O_2}=\dfrac{1}{2}n_{KMnO_4}=0,05\left(mol\right)\Rightarrow V_{O_2}=0,05.22,4=1,12\left(l\right)\)
b, \(2KClO_3\underrightarrow{t^o}2KCl+3O_2\)
\(n_{KClO_3\left(LT\right)}=\dfrac{2}{3}n_{O_2}=\dfrac{1}{30}\left(mol\right)\)
Mà: H% = 80%
\(\Rightarrow n_{KClO_3\left(TT\right)}=\dfrac{\dfrac{1}{30}}{80\%}=\dfrac{1}{24}\left(mol\right)\Rightarrow m_{KClO_3\left(TT\right)}=\dfrac{1}{24}.122,5=\dfrac{245}{48}\left(g\right)\)