Which equation obeys the law of conservation of mass? a. 2c4h10 + 2cl2 + 12o2 7co2 + ccl4 + 10h2o b. c4h10+ cl2 + 2o2 7co2 + ccl4 + 8h2o c. 2c4h10+ 2cl2 + 12o2 4co2 + ccl4 + h2o d. 2c4h10+ 2cl2 + 6o2 co2 + ccl4 + 6h2o e. 4c4h10+ 4cl2 + 14o2 14co2 + ccl4 + 20h2o

Answer : The correct option is A.

Explanation :

Law of conservation of mass : In the chemical reaction, the mass of reactant must be equal to the mass of product.

A.

The mass of reactant side =

The mass of product side =

This means, the mass of product is equal to the mass of reactant. The mass remains conserved and obeys the law of conservation of mass.

The reaction B, C, D, E does not obey the law of conservation of mass.

Therefore, Only reaction A obey the law of conservation of mass.

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.