The cell potential is obtained as 2.46 V.
What is cell potential?
The electric potential difference between the two half-cells of an electrochemical cell is measured as cell potential, sometimes referred to as cell voltage or electromotive force (EMF). It measures the electrons' propensity to flow across electrodes during an electrochemical reaction that occurs on its own.
The cell potential is obtained from;
Ecathode - Eanode
Then;
Ecathode = 0.80 V
Eanode = -1.66 V
Cell potential =
0.80 - ( -1.66)
= 2.46 V