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`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`
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. \(n_{KClO_3}=\dfrac{18.375}{122,5}=0,15\left(mol\right)\)
PTHH : 2KClO3 ----to---> 2KCl + 3O2
0,15 0,225
Phản ứng trên là phản ứng phân hủy . Vì phản ứng phân hủy là một phản ứng hóa học mà trong đó một chất tham gia có thể tạo thành hai hay nhiều chất mới.
b. \(V_{O_2}=0,225.22,4=5,04\left(l\right)\)
c. \(V_{kk}=5,04.5=25,2\left(l\right)\)
\(Câu.2:\\ 2KClO_3\rightarrow\left(t^o\right)2KCl+3O_2\\ n_{KClO_3}=\dfrac{14,7}{122,5}=0,12\left(mol\right)\\ n_{KCl}=n_{KClO_3}=0,12\left(mol\right);n_{O_2}=\dfrac{3}{2}.0,12=0,18\left(mol\right)\\ V_{O_2\left(đkc\right)}=0,18.24,79=4,4622\left(l\right)\\ m_{KCl}=74,5.0,12=8,94\left(g\right)\)
Câu 3:
\(n_{Al}=\dfrac{8,1}{27}=0,3\left(mol\right)\\ PTHH:2Al+6HCl\rightarrow2AlCl_3+3H_2\\ n_{H_2}=\dfrac{3}{2}.n_{Al}=\dfrac{3}{2}.0,3=0,45\left(mol\right)\\ 1,V_{H_2\left(đkc\right)}=24,79.0,45=11,1555\left(l\right)\\ 2,n_{HCl}=\dfrac{6}{2}.0,3=0,9\left(mol\right)\\ V_{ddHCl}=\dfrac{0,9}{1,5}=0,6\left(l\right)\\ 3,n_{AlCl_3}=n_{Al}=0,3\left(mol\right)\\ V_{ddsau}=V_{ddHCl}=0,6\left(l\right)\\ C_{MddAlCl_3}=\dfrac{0,3}{0,6}=0,5\left(M\right)\)
a, \(4Al+3O_2\underrightarrow{t^o}2Al_2O_3\)
b, \(n_{Al}=\dfrac{8,1}{27}=0,3\left(mol\right)\)
Theo PT: \(n_{O_2}=\dfrac{3}{4}n_{Al}=0,225\left(mol\right)\Rightarrow V_{O_2}=0,225.22,4=5,04\left(l\right)\)
c, \(2KClO_3\underrightarrow{t^o}2KCl+3O_2\)
Theo PT: \(n_{KClO_3}=\dfrac{2}{3}n_{O_2}=0,15\left(mol\right)\Rightarrow m_{KClO_3}=0,15.122,5=18,375\left(g\right)\)
\(n_P=\dfrac{7,44}{31}=0,24mol\)
\(4P+5O_2\underrightarrow{t^o}2P_2O_5\)
0,24 0,3 0,12
\(V_{O_2}=0,3\cdot22,4=6,72l\)
\(2KClO_3\underrightarrow{t^o}2KCl+3O_2\)
0,2 0,3
\(m_{KClO_3}=0,2\cdot122,5=24,5g\)
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: \(n_{KClO_3}=0,1\left(mol\right)\) \(\Rightarrow m_{KClO_3}=0,1\cdot122,5=12,25\left(g\right)\)
`#3107.101107`
1.
a.
Ta có:
\(\text{n}_{\text{KClO}_3}=\dfrac{\text{m}_{\text{KClO}_3}}{\text{M}_{\text{KClO}_3}}=\dfrac{122,5}{122,5}=1\text{ (mol)}\)
PTPỨ: \(\text{2KClO}_3\text{ }\)\(\underrightarrow{\text{ }t^0}\) \(\text{2KCl}+3\text{O}_2\)
Ta có: `2` mol \(\text{KClO}_3\) thu được `3` mol \(\text{O}_2\)
`=>` `1` mol \(\text{KClO}_3\) thu được `1,5` mol \(\text{O}_2\)
b.
\(\text{V}_{\text{O}_2}=\text{n}_{\text{O}_2}\cdot24,79=1,5\cdot24,79=37,185\left(l\right)\)
TTĐ:
\(m_{KClO_3}=122,5\left(g\right)\)
______________
a) PTHH?
b) \(V_{O_2}=?\left(l\right)\)
Giải
\(n_{KClO_3}=\dfrac{m}{M}=\dfrac{122,5}{122,5}=1\left(mol\right)\)
\(2KClO_3\underrightarrow{t^o}2KCl+3O_2\uparrow\)
1-> 1 : 1,5(mol)
\(V_{O_2}=n.22,4=1,5.22,4=33,6\left(l\right)\)