Question

Nowadays In a chemical reaction we write reactions then an arrow and then the products.we don't write reactants=products even after balancing.why?
The mass of the reactants is not = to mass of the products.why?

Answer 1

Because reactants never equal to product.
reactants react with each other and give products.
Thats why we are using arrow (gives) symbol.

Also in a balanced chemical equation , mass of the reactants will be equal to mass of product.

You said masses are not equal.Thats wrong