The standard electrode potentials for the following half-reactions are:
\( Zn^{2+} + 2e^- \rightarrow Zn ], with ( E^\circ = -0.76 , \text{V} \)
\([ Cu^{2+} + 2e^- \rightarrow Cu ], with ( E^\circ = +0.34 , \text{V} )\)
What is the standard EMF of the cell when zinc and copper electrodes are used?
1
1.10 V
2
0.42 V
3
-0.42 V
4
1.20 V