Answer:
A
Explanation:
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The empirical formula of metal iodide : CoI₃(Cobalt(III) Iodide)
<h3>Further explanation</h3>
13.02 g sample of Cobalt , then mol Co(MW=58.933 g/mol) :

Mass of metal iodide formed : 97.12 g, so mass of Iodine :

Then mol iodine (MW=126.9045 g/mol) :

mol ratio of Cobalt and Iodine in the compound :
Answer:
In the presence of a base, blue litmus paper will turn red........
You just need the number of protons and number of neutrons as the mass of eelctrons is negligible