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Ta có: \(n_{Al}=\dfrac{10,8}{27}=0,4\left(mol\right)\)
a, PT: \(4Al+3O_2\underrightarrow{t^o}2Al_2O_3\)
_____0,4____0,3___0,2 (mol)
b, \(m_{Al_2O_3}=0,2.102=20,4\left(g\right)\)
c, \(V_{O_2}=0,3.22,4=6,72\left(l\right)\)
Bạn tham khảo nhé!
\(n_{Al}=\dfrac{3,24}{27}=0,12mol\)
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, 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: \(n_{Al_2O_3}=\dfrac{1}{2}n_{Al}=0,1\left(mol\right)\)
\(\Rightarrow m_{Al_2O_3}=0,1.102=10,2\left(g\right)\)
a: \(4Al+3O_2\rightarrow2Al_2O_3\)
c: \(n_{Al}=\dfrac{2.4}{24}=0.1\left(mol\right)\)
\(\Leftrightarrow n_{Al_2O_3}=0.05\left(mol\right)\)
\(m_{Al_2O_3}=0.05\cdot96=1.92\left(g\right)\)
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, \(V_{kk}=\dfrac{V_{O_2}}{20\%}=33,6\left(l\right)\)
nAl=16,2/27= 0,6(mol)
a) PTHH: 4 Al +3 O2 -to-> 2 Al2O3
nO2= 3/4 . nAl=3/4 . 0,6= 0,45(mol)
=> V(O2,đktc)=0,45 x 22,4=10,08(l)
b) nAl2O3= nAl/2=0,6/2=0,3(mol)
=>mAl2O3=102. 0,3= 30,6(g)
c) 2KMnO4 -to-> K2MnO4 + MnO2 + O2
nKMnO4= 2.nO2=2. 0,45=0,9(mol)
=>mKMnO4= 158 x 0,9= 142,2(g)
\(n_{Al}=\dfrac{10,8}{27}=0,4\left(mol\right)\)
PT: \(4Al+3O_2\underrightarrow{t^o}2Al_2O_3\)
a, Theo PT: \(n_{O_2}=\dfrac{3}{4}n_{Al}=0,3\left(mol\right)\Rightarrow V_{O_2}=0,3.22,4=6,72\left(l\right)\)
\(\Rightarrow V_{kk}=5V_{O_2}=33,6\left(l\right)\)
b, Theo PT: \(n_{Al_2O_3}=\dfrac{1}{2}n_{Al}=0,2\left(mol\right)\Rightarrow m_{Al_2O_3}=0,2.102=20,4\left(g\right)\)
a) số mol của 10,8 gam Al:
\(n_{Al}=\dfrac{m}{M}=\dfrac{10,8}{27}=0,4\left(mol\right)\)
PTHH: \(4Al+3O_2\underrightarrow{t^o}2Al_2O_3\)
tỉ lệ 4 : 3 : 2
0,4 -> 0,3 : 0,2
Thể tích của 0,3 mol \(O_2\) :
\(V_{O_2}=n.22,4=0,3.22,4=6,72\left(l\right)\)
Khối lượng của 0,2 mol \(Al_2O_3\) :
\(m_{Al_2O_3}=n.M=0,2.102=20,4\left(g\right)\)
\(n_{Al}=\dfrac{10.8}{27}=0.4\left(mol\right)\)
\(4Al+3O_2\underrightarrow{^{^{t^0}}}2Al_2O_3\)
\(0.4......0.3..........0.2\)
\(m_{Al_2O_3}=0.2\cdot102=20.4\left(g\right)\)
\(V_{O_2}=0.3\cdot22.4=6.72\left(l\right)\)