A student believes that a sample of solid CaCl2 may be contaminated with KNO3(3). Knowing that pure CaCl (s) contains 64% chlorine by mass, the student performs an experiment to determine the mass
percent of chlorine in the sample of CaCl2 (3)
Which of the following results for the mass percent would best support the student's claim that the
sample of CaCl (s) is contaminated with KNO3(s)?​

radioactive decay occurs in unstable atomic nuclei – that is, ones that don't have enough binding energy to hold

the nucleus together due to an excess of either protons or neutrons.

i'm assuming that the correct answer is indeed the first one/ "a"..

answer:

the reaction is type of combination reaction.

explanation:

on the product side, there are 2 molecules of bonded to fe   which means one atom of fe are combined two molecules of . so, balanced chemical equation becomes :

this reaction follows the reaction type of combination reaction. a combination reaction is defined as chemical reaction in which reactants combines together to form a single product.