Achemical equation is shown: al + o2 → al2o3 according to the law of conservation of mass, how many atoms of oxygen exist in the products of this reaction?

 The number  of  oxygen atoms  are 6  atoms

  Explanation

According to the law of mass conservation the number of  reactant atoms   is equal to  number  of product atoms.

For  given equation  to  obey  the  law of mass  conservation  it need to be balanced as below

4 Al + 3 O₂ → 2 Al₂O₃

Al₂O₃  is the  product,therefore the number of oxygen atom

= coefficient  in front  of   Al₂O₃   ×  subscript  of O

=2 x 3  = 6 atoms

6

Explanation: