Ответ:

4AL+3O2=2Al203     

   

 

5.4/108=x/204

 

 

 

x=5.4*204/108

 

 

x=10.2

Ответ:

                                       Al2 O3

                                  27*2  : 16*3

                                     54   : 48

                                       9   : 8

m(Al) : m(O)= 9 :8

5,4 : m(O)=9 :8

m(O)=4,8;

m(Al2O3)=5,4+4,8=10,2г

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