a. PTHH: 4 A l + 3 O 2 t o → 2 A l 2 O 3 b. n A l = 21 , 6 27 = 0 , 8 ( m o l ) 4 A l + 3 O 2 t o → 2 A l 2 O 3 Theo pt: 4 3 2 Theo đề: 0,8 0,6 0,4 (mol) m A l 2 O 3 = 0 , 4 × 102 = 40 , 8 ( g a m ) c. V O 2 = 0 , 6 × 22 , 4 = 13 , 44 ( l í t )
\(n_{Al}=\dfrac{21,6}{27}=0,8mol\)
\(4Al+3O_2\rightarrow\left(t^o\right)2Al_2O_3\)
0,8 0,6 0,4 ( mol )
\(V_{O_2}=0,6.22,4=13,44l\)
\(m_{Al_2O_3}=0,4.102=40,8g\)
\(V_{kk}=13,44.5=67,2l\)