Cecil writes the equation for the reaction of hydrogen and oxygen below.
h2 + o2 → h2o
why does his teacher ask him to balance the equation by including the correct coefficients?
a. to show that most molecules exist in pairs
b. to show that most compounds exist in pairs
c. to show that atoms are conserved in chemical reactions
d, to show that atoms are created in chemical reactions

C) to show that atoms are conserved in chemical reactions

Explanation:

When writing a chemical reaction, we should always consider the Mass Conservation Law, which basically states that; in an isolated system; the total mass should remain constant, this is, the total mass of the reactives should be equal to the total mass of the products

For this case, we should add the apporpiate coefficients in order to be in compliance with this law:

2H₂ + O₂ → 2H₂O

So, we can check the above statement:

For reactives (left side):

4H

2O

For product (right side):

4H

2O