\(n_{Al}=\dfrac{2,4.10^{23}}{6.10^{23}}=0,4(mol)\\ PTHH:4Al+3O_2\xrightarrow{t^o}2Al_2O_3\\ \Rightarrow n_{Al_2O_3}=0,2(mol);n_{O_2}=0,3(mol)\\ a,V_{O_2}=0,3.22,4=6,72(l)\\ \Rightarrow V_{kk}=6,72.5=33,6(l)\\ b,m_{Al_2O_3}=0,2.102=20,4(g)\)
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