No, it's a cation.
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30 mg
The compound FeF3 is a salt, meaning that it has a covalent bond. Split the anion and the cation apart to determine the charge. Since iron can be either +2 or +3, you have to look at the anion (F- in this case) and look at how many negative charges are there. If there are three F-, that means there are three negative charges. That should tell you which iron is involved in the bond.
MgCl2 aq plus Zn s is the oxidation half-reaction for Mg s plus ZnCl2 aq.
12.5 mg * 2 = 25.0 mg.
Absallutly!