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a.\(n_{KMnO_4}=\dfrac{m_{KMnO_4}}{M_{KMnO_4}}=\dfrac{3,16}{158}=0,02mol\)
\(2KMnO_4\rightarrow\left(t^o\right)K_2MnO_4+MnO_2+O_2\)
0,02 0,01 ( mol )
\(V_{O_2}=n_{O_2}.22,4=0,01.22,4=0,224l\)
b.
\(4Al+3O_2\rightarrow\left(t^o\right)2Al_2O_3\)
1/75 0,01 1/150 ( mol )
\(m_{Al}=n_{Al}.M_{Al}=\dfrac{1}{75}.27=0,36g\)
\(m_{Al_2O_3}=n_{Al_2O_3}.M_{Al_2O_3}=\dfrac{1}{150}.102=0,68g\)
2KMnO4-to>K2MnO4+MnO2+O2
0,02-------------------------------------0,01
4Al+3O2-to->2Al2O3
\(\dfrac{1}{75}\)---0,01---------\(\dfrac{1}{150}\)
n KMnO4=\(\dfrac{3,16}{158}\)=0,02 mol
=>VO2=0,01.22,4=0,224 l
b)m Al=\(\dfrac{1}{75}\).27=0,36g
=>m Al2O3=\(\dfrac{1}{150}\)102=0,68g
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
\(m_{KClO_3}=n.M=0,6.\left(39+35,5+16.3\right)=55,5\left(g\right).\)
\(n_{KClO_3\left(bd\right)}=\dfrac{55,125}{122,5}=0,45\left(mol\right)\)
=> \(n_{KClO_3\left(pư\right)}=\dfrac{0,45.85}{100}=0,3825\left(mol\right)\)
PTHH: 2KClO3 --to,MnO2--> 2KCl + 3O2
0,3825------------------->0,57375
=> \(V_{O_2}=0,57375.22,4=12,852\left(l\right)\)
a)PTHH:2KClO\(_3\)➞\(^{t^o}\)2KCl+3O\(_2\)
b) n\(_{KClO_3}\)=\(\dfrac{m_{KClO_3}}{M_{KClO_3}}\)=\(\dfrac{12,15}{122,5}\)\(\approx\)0,1(m)
PTHH : 2KClO\(_3\) ➞\(^{t^o}\) 2KCl + 3O\(_2\)
tỉ lệ : 2 2 3
số mol : 0,1 0,1 0,15
V\(_{O_2}\)=n\(_{O_2}\).22,4=0,15.22,4=3,36(l)
c)PTHH : 2Zn + O\(_2\) -> 2ZnO
tỉ lệ : 2 1 2
số mol :0,3 0,15 0,3
m\(_{Zn}\)=n\(_{Zn}\).M\(_{Zn}\)=0,3.65=19,5(g)
nKClO3 - 12.25/122.5 = 0.1 (mol)
2KClO3 -to-> 2KCl + 3O2
0.1_______________0.15
VO2 = 0.15*22.4 = 3.36 (l)
nH2 = 4.48/22.4 = 0.2 (mol)
2H2 + O2 -to-> 2H2O
0.2___0.1______0.2
=> O2 dư
mH2O = 0.2*18 = 3.6(g)
n KClO3=m/M=12,25/122,5=0,1 (mol)
a/ 2KClO3 --> 2KCl +3O2
TPT: 2 2 3 (mol)
TĐB:0,1 0,1 0,15 (mol)
b/ V O2=n*22,4=0,15*22,4=3,36 ( l)
c/ n H2=V/22,4=4,48/22,4=0,2 (mol)
PTHH: 2H2 +O2 --> 2H2O
TPT: 2 1 2 (mol)
TĐB: 0,2 0,15 (mol)
Xét tỉ lệ 0,2/2 < 0,15/1
=> H2 pư hết O2 pư dư
n H2O= 0,2*2/2=0,2 (mol)
m H2O = n*M=0,2 *18=3,6 (g)
Mik chắc chắn đúng tại mik học sinh chuyên hóa
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)
\(a,PTHH:2KMnO_4\rightarrow\left(t^o\right)K_2MnO_4+MnO_2+O_2\\ b,n_{KMnO_4}=\dfrac{15,8}{158}=0,1\left(mol\right)\\ n_{O_2}=\dfrac{0,1}{2}=0,05\left(mol\right)\\ V_{O_2\left(đktc\right)}=0,05.22,4=1,12\left(l\right)\\ c,4P+5O_2\rightarrow\left(t^o\right)2P_2O_5\\ n_{P_2O_5}=\dfrac{2}{5}.n_{O_2}=\dfrac{2}{5}.0,05=0,02\left(mol\right)\\ m_{P_2O_5}=0,02.142=2,84\left(g\right)\)
a, \(4Al+3O_2\underrightarrow{t^o}2Al_2O_3\)
b, \(n_{Al_2O_3}=\dfrac{20,4}{102}=0,2\left(mol\right)\)
Theo PT: \(n_{O_2}=\dfrac{3}{2}n_{Al_2O_3}=0,3\left(mol\right)\Rightarrow V_{O_2}=0,3.22,4=6,72\left(l\right)\)
c, \(V_{kk}=\dfrac{V_{O_2}}{20\%}=33,6\left(l\right)\)
Câu 3.
a.b.\(n_{KClO_3}=\dfrac{24,5}{122,5}=0,2mol\)
\(2KClO_3\rightarrow\left(t^o,MnO_2\right)2KCl+3O_2\)
0,2 0,3 ( mol )
\(V_{O_2}=0,3.22,4=6,72l\)
c.\(n_{Al}=\dfrac{5,4}{27}=0,2mol\)
\(4Al+3O_2\rightarrow\left(t^o\right)2Al_2O_3\)
0,2 < 0,3 ( mol )
0,2 0,1 ( mol )
\(m_{Al_2O_3}=0,1.102=10,2g\)
Câu 4.
a.b.
\(n_{KClO_3}=\dfrac{12,25}{122,5}=0,1mol\)
\(2KClO_3\rightarrow\left(t^o,MnO_2\right)2KCl+3O_2\)
0,1 0,15 ( mol )
\(V_{O_2}=0,15.22,4=3,36l\)
c.\(n_{Fe}=\dfrac{8,4}{56}=0,15mol\)
\(3Fe+2O_2\rightarrow\left(t^o\right)Fe_3O_4\)
0,15 < 0,15 ( mol )
0,15 0,05 ( mol )
\(m_{Fe_3O_4}=0,05.232=11,6g\)