In the chemical reaction below, sodium (na) and chlorine (cl) combine to form sodium chloride (nacl). 2na + cl2 → 2nacl if the combined mass of the starting reactants is 50 grams, then the mass of sodium chloride formed once the reaction has reached completion a. will be exactly 50 grams. b. will be less than 50 grams. c. will be exactly 100 grams. d. will be between 50 and 100 grams.

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,

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.