Question

Acc. To law of conservation of mass the total mass remain constant before and after a chemical reaction .But in exothermic reaction the some amount of mass gets converted into form of energy required for the binding energy for the formation of that compound and opposite happen in endothermic. 

But we are not able to measure that change in mass. So does this mean that mass is not destroyed?


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Answer 1

Answer:

Mass does not get destroyed in a chemical reaction.The heat which you observe is the heat from the surroundings. To break the bond, some amount of energy is required but that does not change the mass of reactants or products. The reactants break their bonds and form new bonds or do not form new bonds. Heat is a by product if it is exothermic. If heat is required for decomposition reactions, it is used on the reactants. Mass doesn't get converted to heat. The breaking of bonds of atoms/ions requires heat/any other form of energy such as electricity and sunlight.

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