Final answer:
Calcium bromide (CaBr2) completely ionizes to produce one Ca2+ ion and two Br- ions, totaling three ions. For 0.2 moles of CaBr2, there will be 0.2 moles of Ca2+ ions and 0.4 moles of Br- ions.
Step-by-step explanation:
The chemical formula CaBr2 represents calcium bromide. When completely ionized in a solution, it produces one calcium ion (Ca2+) and two bromide ions (Br-). Therefore, the total number of ions produced from one formula unit of CaBr2, when it is completely ionized, would be three.
a. Since there is one calcium ion per formula unit, the number of moles of Mg2+ ions will be the same as the number of moles of CaBr2, which is 0.2 moles.
b. Because there are two bromide ions for every calcium ion, the number of moles of Br- ions will be twice that of CaBr2, resulting in 0.4 moles of Br- ions.