How many grams of oxygen would we need to consume to produce 13.9 grams of MgO

5.56g

Explanation:

Expression of the equation:

                      2Mg  +  O₂  →  2MgO

Mass of MgO = 13.9g

Solution:

         2Mg  +  O₂  →  2MgO

To solve this problem, let us find the number of moles of MgO from the given mas;

  Number of moles  =  

  molar mass of MgO  = 24 + 16  = 40g/mol

  Number of moles  =   = 0.35mole

Now,

           2 moles of MgO is produced from 1 mole of oxygen gas

          0.35 mole of MgO will be produced from mole of oxygen gas

                                                                               = 0.17mole of oxygen gas

So;

 Mass of oxygen gas  =  number of moles x molar mass

      Molar mass of O₂  = 2(16) = 32g/mol

  Mass of oxygen gas  = 0.17 x 32  = 5.56g

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explanation: