Question

What will be the change in entropy for decomposition of caco3?

Answer 1

Entropy of the system increases in case of decomposition of calcium carbonate

Explanation:

Entropy is a measure of thermal energy of system which is not used to gain useful work. generally it is a measure of disorder of molecules in a system.

• Following chemical reaction takes place during the decomposition of $CaCO_3$  
• $CaCO_3 \to CaO+CO_2\uparrow$  
• Thus calcium carbonate releases carbon dioxide gas in products.
• It means that solid is changed in to gas in this system.

• Thus randomness of molecules increases from reactants to products during the decomposition of $CaCO_3$    
• Hence entropy of the system increases.