Answer: Option (A) is the correct answer.
Explanation:
According to law of conservation of mass, mass can neither be created nor it can be destroyed. It can only be changed from one form to another.
This means that in a chemical reaction, the mass of reactants will always be equal to the mass of products.
For example, [tex]2Na + Cl_{2} \rightarrow 2NaCl[/tex]
As it is given that, mass of reactants is 50 grams. Then accoding to the law of conservation of mass the product will also have a mass of 50 grams.
Thus, we can conclude that the mass of sodium chloride formed once the reaction has reached completion will be exactly 50 grams.
