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$a)2KClO_3 \xrightarrow{t^o} 2KCl + 3O_2$
$b) n_{KClO_3} = \dfrac{73,5}{122,5} = 0,6(mol)$
$n_{KCl} = n_{KClO_3} = 0,6(mol)$
$m_{KCl} = 0,6.74,5 = 44,7(gam)$
$c) n_{O_2} = \dfrac{3}{2}n_{KClO_3} = 0,9(mol)$
$V_{O_2} = 0,9.22,4 = 20,16(lít)$
2KClO3 -- > 2KCl + O2
nKClO3 = 73,5 / 122,5 = 0,6 (mol)
mKCl = 0,6 . 74,5 = 44,7 (g)
VO2 = 0,3 . 22,4 = 6,72 (l)
\(n_{Al}=\dfrac{3,24}{27}=0,12mol\)
a)\(4Al+3O_2\underrightarrow{t^o}2Al_2O_3\) \(\Rightarrow\) phản ứng hóa hợp.
b)0,12 0,09 0,06
\(m_{Al_2O_3}=0,06\cdot102=6,12g\)
c)\(V_{O_2}=0,09\cdot22,4=2,016l\)
a) PTHH: 2 KClO3 -to-> 2 KCl + 3 O2
nKCl= 14,9/74,5= 0,2(mol)
b) nKClO3=nKCl=0,2(mol)
=>mKClO3=0,2.122,5=24,5(g)
c) nO2=3/2. 0,2=0,3(mol)
=>V(O2,đktc)=0,3.22,4=6,72(l)
\(a,PTHH:2KMnO_4\rightarrow\left(t^o\right)K_2MnO_4+MnO_2+O_2\\ b,n_{KMnO_4}=\dfrac{15,8}{158}=0,1\left(mol\right)\\ n_{O_2}=\dfrac{0,1}{2}=0,05\left(mol\right)\\ V_{O_2\left(đktc\right)}=0,05.22,4=1,12\left(l\right)\\ c,4P+5O_2\rightarrow\left(t^o\right)2P_2O_5\\ n_{P_2O_5}=\dfrac{2}{5}.n_{O_2}=\dfrac{2}{5}.0,05=0,02\left(mol\right)\\ m_{P_2O_5}=0,02.142=2,84\left(g\right)\)
a)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)
a)\(n_{Fe}=\dfrac{22,4}{56}=0,4mol\)
\(3Fe+2O_2\underrightarrow{t^o}Fe_3O_4\)
0,4 \(\dfrac{4}{15}\) \(\dfrac{2}{15}\)
\(V_{O_2}=\dfrac{4}{15}\cdot22,4=5,973l\)
b)\(2KClO_3\underrightarrow{t^o}2KCl+3O_2\)
\(\dfrac{8}{45}\) \(\dfrac{4}{15}\)
\(m_{KClO_3}=\dfrac{8}{45}\cdot122,5=21,78g\)
a, PT: \(4Al+3O_2\underrightarrow{t^o}2Al_2O_3\)
b, Ta có: \(n_{Al}=\dfrac{5,4}{27}=0,2\left(mol\right)\)
Theo PT: \(n_{O_2}=\dfrac{3}{4}n_{Al}=0,15\left(mol\right)\)
\(\Rightarrow V_{O_2}=0,15.22,4=3,36\left(l\right)\)
c, Theo PT: \(n_{Al_2O_3}=\dfrac{1}{2}n_{Al}=0,1\left(mol\right)\)
\(\Rightarrow m_{Al_2O_3}=0,1.102=10,2\left(g\right)\)
2KClO3 ---> 2KCl +3O2
nKClo3 = 24,5/122,5 = 0,2 mol
nKCl = nKClo3 =0,2 mol
m Kcl = 0,2 x 74,5 = 14,9g
no2 = 0,2x3:2 = 0,3mol
Vo2 = n.22,4 = 6,72 lít
4)
a) \(2KClO_3\underrightarrow{t^o}2KCl+3O_2\)
\(n_{KClO_3}=\frac{73.5}{122.5}=0.6\left(mol\right)\)
b)
\(n_{KCl}=n_{KClO_3}=0.6\left(môl\right)\)
\(\Rightarrow m_{KCl}=0.6\cdot74.5=44.7\left(g\right)\)
c)
\(n_{O_2}=\frac{3}{2}\cdot n_{KClO_3}=\frac{3}{2}\cdot0.6=0.9\left(mol\right)\)
\(\Rightarrow V_{O_2}=0.9\cdot22.4=20.16\left(l\right)\)
Bài 4:
a,
\(PTHH:2KClO_3\rightarrow2KCl+3O_2\)
b, Ta có :
\(n_{KClO3}==\frac{73,5}{122,5}=0,6\left(mol\right)\)
\(\Rightarrow n_{KCl}=n_{KClO3}=0,6\left(mol\right)\)
\(\Rightarrow m_{KClO3}=0,6.74,5=44,7\left(g\right)\)
c,\(n_{O2}=\frac{3}{n}n_{KClO3}=\frac{3}{2}.0,6=0,9\left(mol\right)\)
\(\Rightarrow V_{KClO3}=0,9.22,4=20,16\left(l\right)\)
Bài 5 :
a,
\(PTHH:4Al+3O_2\rightarrow2Al_2O_3\)
b, Ta có :
\(n_{Al}=\frac{13,7}{27}=0,5\left(mol\right)\)
\(\Rightarrow n_{Al2O3}=\frac{1}{2}n_{Al}=\frac{1}{2}.0,5=0,25\left(mol\right)\)
\(\Rightarrow m_{Al2O3}=0,25.102=25,5\left(g\right)\)
c,\(n_{O2}=\frac{3}{4}n_{Al}=\frac{3}{4}.0,5=0,375\left(mol\right)\)
\(\Rightarrow V_{O2}=0,375.22,4=8,4\left(l\right)\)