# Standard free energies of formation ( in kJ / mol ) at 298 K are -237.2, -394.4 and -8.2 for $H_2O(I) , CO_2(g) \: and \: pentane (g)$ respectively. The value of $E^{\circ}_{cell}$ for the pentane oxygen fuel cell is :

$\begin {array} {1 1} (1)\;0.0968 \: V & \quad (2)\;1.968 \: V \\ (3)\;2.0968\: V & \quad (4)\;1.0968\: V \end {array}$