Question

Calcium reacts with the oxygen in the air, forming calcium oxide. write the balanced chemical equation for this reaction. what is the sum of the coefficients?

Answer 1

calcium  react  with  oxygen to  form  calcium  oxide  that  is  quicklime  or  burnt  lime  which  is  white  at  room  temperature
  The   balanced chemical  equation  is
2Ca(s)  + O2(g)  --->2CaO(S) - a  white solid  at  room  temperature
2  moles of  Ca reacted  with    1   mole  of  O2   while    to  form  2  moles of  CaO
hence  the  sum  coefficient = 2+1+2=5

Answer 2

Explanation:

When calcium is chemically combining with oxygen then it results into the formation of chemical compound called calcium oxide.

The chemical reaction equation for this reaction is as follows.

         $Ca + O_{2} \rightarrow CaO$

As there are not equal number of atoms on both reactant and product side. Therefore, the balanced equation will be as follows.

       $2Ca + O_{2} \rightarrow 2CaO$          

It is known that numbers present before the elements or compounds in a reaction equation are known as coefficients.

Therefore, sum of the coefficients in this equation is 2 + 1 + 2 = 5.