The equation for water is H2 +O2 → H2O. To balance the equation, which coefficient should be placed in front of H2 and H2O? 1
2
3
4

2

Explanation:

2H2 + 02 ===> 2H20

Your first job is to balance the oxygens. The left side has 2 and so you must put a 2 in front of the H20.

The H2 and H2O are then balanced.

a. energy is absorbed in the reaction.

if in a given reaction the energy of products is greater than the energy of reactants it means that reaction is endothermic and during the reaction, the energy is absorbed by reactants. in an endothermic reaction, the products have more stored chemical energy than the reactants. and in this reaction the reactants are more stable than products before the compounds with less energy are always more stable.