If 3.50 mol of ethane, CzH6, undergo combustion according to the unbalaced equation given of oxygen requires ? How many moles of each product formed?

The Balance Chemical equation for said reaction is as follow,

                        C₂H₆   + 3.5 O₂    →    2 CO₂  +  3 H₂O

Or,

                       2 C₂H₆   + 7 O₂    →    4 CO₂  +  6 H₂O

According to equation,

       2 moles of Ethane react completely with  =  7 moles of Oxygen

So,

              4.20 moles of Ethane will react with  =  X moles of Oxygen

Solving for X,

                            X  =  (4.20 mol × 7 mol) ÷ 2 mol

                            X  = 14.7 moles of Oxygen

Result:

           14.7 moles of Oxygen are required to react with 4.20 moles of Ethane for complete reaction.

  the   balanced   equation   for   reaction of   ca metal   with   o2 to   produce   cao   is as below

2 ca+ o2→ 2 cao2

  explanation

the reaction is   balanced     since the   number of atoms   in reactant side is   equal to   number of atoms   in   product side.   for   example   they   are 2   atom of   ca in   reactant   side   and   2   atoms of ca   in   the product side.

  the   process   is a   meet the   requirement   of   redox   reaction because :     calcium   is   oxidized   from   oxidation state 0   to 2+   while   oxygen   is reduced from   oxidation   state   0   to 2-