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The complete balanced chemical reaction is:

C7H16  +  3O2  -->  7CO2  +  8H2O

 

So 3 moles of oxygen O2 is required for every 1 mole of C7H16. In the same manner, 3 molecules of O2 is required for every 1 molecule of C7H16.

 

Answer:

3 molecules O2