Everything that I have read has either been wrong or confusing. Please help. Thank you. A voltaic cell employs the follo

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Everything that I have read has either been wrong or confusing.
Please help. Thank you.
A voltaic cell employs the following redox reaction:
2Fe3+(aq)+3Mg(s)→2Fe(s)+3Mg2+(aq)
Calculate the cell potential at 25 ∘C under each of the
following conditions.
Part A
standard conditions
Part B
[Fe3+]= 2.5×10−3 M ;
[Mg2+]= 1.75 M
Part C
[Fe3+]= 1.75 M
[Mg2+]= 2.5×10−3 M
Express your answer in units of volts.