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12) 12) Choose the best classification of the reaction represented by the following equation: 2Fe3 (ag)+ Fe(s)3Fe2+(ag) A) ox
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Answer #1

12)
In reactant, oxidation state of Fe is +3 and 0
In product, oxidation state of Fe is +2

So,
Oxidation state of Fe is changing from +3 to +2 which is reduction.
Oxidation state of Fe is changing from 0 to +2 which is oxidation.

So, there is both reduction and oxidation taking place.

Answer:   A

13)
Mass = 15.0 mg = 0.0150 g
Molar mass = 309.36 g/mol

Use:
Number of mol = mass / molar mass
= 0.0150 g / 309.36 g/mol
= 4.85*10^-5 mol

Answer: D

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