According to_________________, the total mass remains conserved in any chemical reaction.

• Chemical reaction

A chemical reaction is a process in which one or more substances react with each other to form one or more new substances,

For example, Combustion of coal, rusting of iron rods, Photosynthesis, etc.

• Law of mass conservation

The law of conservation of mass states that in a chemical reaction mass is neither created nor destroyed.

For example, On decomposition of 100 grams of Calcium carbonate$\left({\mathrm{CaCO}}_3\right)$ it gives 38 grams of Carbon dioxide$\left({\mathrm{CO}}_2\right)$ and 62 grams of Calcium oxide CaO.

$$\begin{gathered} \text{Total mass of reactants(Calcium carbonate)=Total mass of products(Carbon dioxide+Calcium oxide)} \\ 100\mathrm{g}=\left(38+62\right)\mathrm{g} \\ 100\mathrm{g}=100\mathrm{g} \end{gathered}$$

• Therefore, According to Law of mass conservation, the total mass remains conserved in any chemical reaction.