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# Predicting $E^o_{cell}$ from Half-Reactions

APCHEM-KZUSIC

Which of the following expressions gives the correct value for the standard potential for a gold-rhodium voltaic cell?

Half-reaction $E^o (V) \quad$
$Rh^{+3}_{(aq)}+3e^- \rightarrow Rh_{(s)} \quad$ 0.76 V
$Au^+_{(aq)}+e^- \rightarrow Au_{(s)} \quad$ 1.69 V
A

$1.69 \text{ V} + 0.76 \text{ V}$

B

$1.69 \text{ V} – 0.76 \text{ V}$

C

$3(1.69) \text{ V} + 0.76 \text{ V}$

D

$3(1.69 \text{ V}) – 0.76 \text{ V}$