ANSWÈR :-
The law of conservation of mass states that in a chemical reaction, the total mass of the reactants must be equal to the total mass of the products. This means that no atoms are created or destroyed during a chemical reaction, only rearranged. Therefore, any balanced chemical equation follows the law of conservation of mass.
A balanced chemical equation is one where the number of atoms of each element on both sides of the equation is equal. For example, the equation for the combustion of methane (CH4) in oxygen (O2) to form carbon dioxide (CO2) and water (H2O) is:
CH4 + 2O2 → CO2 + 2H2O
In this equation, there is one carbon atom, four hydrogen atoms, and four oxygen atoms on both sides of the equation. This demonstrates that the law of conservation of mass is being followed.
Other examples of balanced chemical equations that follow the law of conservation of mass include:
- 2H2 + O2 → 2H2O (the synthesis of water)
- Fe + 2HCl → FeCl2 + H2 (the reaction between iron and hydrochloric acid)
- NaOH + HCl → NaCl + H2O (the neutralization reaction between sodium hydroxide and hydrochloric acid)
Overall, any balanced chemical equation follows the law of conservation of mass as it ensures that the total mass of the reactants is equal to the total mass of the products.