Photosysthesis si a bio process by which plants make energy rich molecules from low energy molecules with the help of energy from sunlight . The photosysthesis of glucose can be represented as:
`6CO_(2(g))+ 6H_(2)O_(g) + hv rarr C_(5)H_(12)O_(6(s)) + 6O_(2)(g)..........(i)`
The energy of one mole of a photon of wave lenght is known as one Einstein.
Calculate the emf of this fuel cell at `25^(@)` C if `DeltaH^(@)` and `DeltaS^(@)` of photosynthesis are `2.82xx10^(6) "J mol"^(-1)` and -182 `J"mol"^(-1)` respectively.

Answer

`DeltaG^(@) = DeltaH^(@) - TDeltaS^(@)`
`=2.82 xx 10^(6) - 298 xx - 182`
=2874236
`DeltaG^(@) =-n F E^(@)`
`implies E^(@) =(-2874236)/(24 xx 96500)=-1.24 V`