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a) 2Al + 3H2SO4 --> Al2(SO4)3 + 3H2
b) \(n_{Al}=\dfrac{10,8}{27}=0,4\left(mol\right)\)
PTHH: 2Al + 3H2SO4 --> Al2(SO4)3 + 3H2
0,4--->0,6-------------------->0,6
=> VH2 = 0,6.22,4 = 13,44 (l)
c) \(V_{dd.H_2SO_4}=\dfrac{0,6}{1}=0,6\left(l\right)\)
d) \(n_{Fe_2O_3}=\dfrac{16}{160}=0,1\left(mol\right)\)
PTHH: Fe2O3 + 3H2 --to--> 2Fe + 3H2O
Xét tỉ lệ: \(\dfrac{0,1}{1}< \dfrac{0,6}{3}\) => Fe2O3 hết, H2 dư
PTHH: Fe2O3 + 3H2 --to--> 2Fe + 3H2O
0,1----------------->0,2
=> mFe = 0,2.56 = 11,2 (g)
PTHH: \(CuO+H_2SO_4\rightarrow CuSO_4+H_2O\)
Ta có: \(n_{CuO}=\dfrac{29,4}{80}=0,3675\left(mol\right)=n_{CuSO_4}=n_{H_2SO_4}\)
\(\Rightarrow\left\{{}\begin{matrix}m_{CuSO_4}=0,3675\cdot160=58,8\left(g\right)\\m_{H_2SO_4}=0,3675\cdot98=36,015\left(g\right)\\V_{H_2SO_4}=\dfrac{0,3675}{1}=0,3675\left(l\right)=367,5\left(ml\right)\end{matrix}\right.\)
4Al+3O2-to>2Al2O3
0,4----0,3-----0,2
n Al=0,4 mol
=>m Al2O3=0,2.102=20,4g
=>VO2=0,3.22,4=6,72l
2KClO3-to>2KCl+3O2
0,2----------------------0,3
=>m KClO3=0,2.122,5=24,5g
nAl = 10,8 : 27 = 0,4 (mol)
pthh : 4Al + 3O2 -t--> 2Al2O3
0,4-->0,3-------> 0,2 (mol)
mAl2O3 = 0,2 . 102 = 20,4 (g)
VH2 = 0,3 . 22,4 = 6,72 (L)
pthh: 2KClO3 -t--> 2KCl + 3O2
0,2<----------------------0,3 (mol)
=> mKClO3 = 0,2 . 122,5 = 24,5 (g)
\(a,PTHH:2Al+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2\\ n_{H_2}=\dfrac{3,36}{22,4}=0,15\left(mol\right)\\ \Rightarrow n_{Al}=\dfrac{2}{3}n_{H_2}=0,1\left(mol\right)\\ \Rightarrow m_{Al}=0,1\cdot27=2,7\left(g\right)\\ b,n_{H_2SO_4}=n_{H_2}=0,15\left(mol\right)\\ \Rightarrow m_{H_2SO_4}=0,15\cdot98=14,7\left(g\right)\\ c,n_{Al_2\left(SO_4\right)_3}=\dfrac{1}{3}n_{H_2}=0,05\left(mol\right)\\ \Rightarrow m_{Al_2\left(SO_4\right)_3}=0,05\cdot342=17,1\left(g\right)\)
a) $4Al + 3O_2 \xrightarrow{t^o} 2Al_2O_3$
b) $n_{O_2} = \dfrac{6,72}{22,4} = 0,3(mol)$
$n_{Al\ pư} = \dfrac{4}{3}n_{O_2} = 0,4(mol)$
$m_{Al\ pư} = 0,4.27 = 10,8(gam)$
c)
Cách 1 :
$m_{Al_2O_3} = m_{Al} + m_{O_2} = 10,8 + 0,3.32 = 20,4(gam)$
Cách 2 :
Theo PTHH, $n_{Al_2O_3} = \dfrac{1}{2}n_{Al\ pư} = 0,2(mol)$
$m_{Al_2O_3} = 0,2.102 = 20,4(gam)$
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, \(V_{kk}=\dfrac{V_{O_2}}{20\%}=33,6\left(l\right)\)
Bài 1:
\(4Al+3O_2\underrightarrow{t^o}2Al_2O_3\)
\(n_{Al_2O_3}=\dfrac{m}{M}=\dfrac{20,4}{102}=0,2\left(mol\right)\)
Theo PTHH, \(n_{Al}=2n_{Al_2O_3}=2\cdot0,2=0,4\left(mol\right)\)
\(m_{Al}=n\cdot M=0,4\cdot27=10,8\left(g\right)\)
Theo PTHH, \(n_{O_2}=\dfrac{3}{2}n_{Al_2O_3}=\dfrac{3}{2}\cdot0,2=0,3\left(mol\right)\)
\(V_{O_2}=n\cdot22,4=0,3\cdot22,4=6,72\left(l\right)\)
Bài 1:
4Al + 3O2 \(\underrightarrow{to}\) 2Al2O3
\(n_{Al_2O_3}=\dfrac{20,4}{102}=0,2\left(mol\right)\)
a) theo PT: \(n_{Al}=2n_{Al_2O_3}=2\times0,2=0,4\left(mol\right)\)
\(\Rightarrow m=m_{Al}=0,2\times27=5,4\left(g\right)\)
b) theo PT: \(n_{O_2}=\dfrac{3}{2}n_{Al_2O_3}=\dfrac{3}{2}\times0,2=0,3\left(mol\right)\)
\(\Rightarrow V_{O_2}=0,3\times22,4=6,72\left(l\right)\)