nAl=2,7/27=0,1(mol)
PTHH: 4Al +3 O2 -to-> 2 Al2O3
0,1________________0,05(mol)
mAl2O3=102.0,05=5,1(g)
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\(n_{Al}=\dfrac{2.7}{27}=0.1\left(mol\right)\)
\(4Al+3O_2\underrightarrow{^{^{t^o}}}Al_2O_3\)
\(0.1......0.075\)
\(V_{O_2}=0.075\cdot22.4=1.68\left(l\right)\)
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