Respuesta :

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 The  number of oxygen   atoms  that are  in 4 Al₂O₃  are 12 atoms


Explanation

  • The subscript  in  a chemical formula indicate the  number  of atoms of element  immediately   before the subscript.
  • coefficient  is the  number  in front  of  the formula  and tells  us how many molecules  of a given formula  are  present.
  • Since 4Al₂O₃  has coefficient of 4   and the subscript   of O is 3 the number of O atoms =  4 x 3=12 atoms

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