27. (24 pts) Energetics of photosynthesis a) Write out the balanced equation for

Question

27. (24 pts) Energetics of photosynthesis a) Write out the balanced equation for the light reactions of photosynthesis, in which water is oxidized to produce NADPH. b) What is the diving force, in V, for this reaction ? c) What is the Gn for this reaction at 298 K ? d) How can this reaction occur? (ie. what is needed for the reaction to go as written?) d) How can this reaction occur ? (ie what is neded for the reaction to go as writen?) e) How many einsteins of the red light of the devil ( reaction go 2 666 nm) would be needed to make this

Explanation / Answer

1 glucose + 2 ADP + 2 Pi + 2 NAD <--> 2 pyruvate + 2 ATP + 2 NADH2

Delta Go = -18 kcal/mole

driving force is ATP molecules

Delta G = Delta Go + RTln([products]/[reactants]),    where RT~0.6 (in kcal/mole)

e)    E = hc/lemda = ( 6.626* 10^-34 * 3 * 10^8 )/6.66*10^-19

                                = 2.98*10^-17 J

No of einsteins   =   18*1000*4.186/2.98*10^-17   .....(einsteins   = Total energy / energy of one einstein)

                         = 2.528*10^28

(E=hc/ lemda

where h is Planck's constant and c is the speed of light.

h = 6.626 × 10 -34 joule·s

c = 2.998 × 108 m/s)

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