Question

H2 + CL2 = 2HCL prove that they are in accordance with the law of conservation of mass​

Answer 1

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

your equation follow this rule dude..

Answer 2

law of conservation of mass says that the total mass of reactants is equal to the total mass of the product

ie; mass can neither be created not be destroyed in a chemical reaction.

here the reactants are H2 and Cl2

so the sum of their masses is (1×2)+(35.5×2)= 2+71= 73g

here the products are 2HCl

so the mass of product is 2(1+35.5)= 2×36.5= 73g

therefore the mass of reactants is equal to the mass of the product

hence this equation is in accordance with the law of conservation of mass.