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 100 grams.

b.
will be between 50 and 100 grams.

c.
will be exactly 50 grams.

d.
will be less than 50 grams.