Propane is often used in stoves and cooktops as a source of heat. The combustion of propane yields water and carbon unbalanced chemical reaction is represented by the ball-and-stick diagrama shown.
How many molecules of carbon dioxide and water are produced during the combustion of propane? Move numbers to
the equation and show that mass is conserved.
+
+
Propane molecule
Oxygen molecules
Carbon dioxide molecule
Water molecule
Legend
Hydrogen
atom
Oxygen
atom
Carbon
atom
2
3

3 molecules of carbon dioxide and 4 molecules of water are produced during the combustion of propane.

Explanation:

According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products has to be equal to the mass of reactants. The number of atoms of each element has to be same on reactant and product side. Thus chemical equations are balanced.

The balanced chemical reaction for combustion of propane is:

3 molecules of carbon dioxide and 4 molecules of water are produced during the combustion of propane.

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.