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Calculate the potential for each of the following cells then write the overall reaction. (These reactions...

Calculate the potential for each of the following cells then write the overall reaction.
(These reactions are given in reduction order for both half-cells.)
a. 0.010M Zn2+/Zn//0.25M H1+/ 0.30atm H2 at exactly 200C
b. 0.80M Ni2+/Ni// 0.20M Co2+//Co at 270C
c. 0.050M NO31-, 0.10M H1+/ 0.15atm NO// 0.025M Cr2O72-, 0.10M H1+ /0.125M Cr3+
at 310C
*Please go step by step*

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