Question

Consider the following reaction: 6 CO2 + 6 H2O ? (CH2O)4H (glucose) + 6 02 Will...

Consider the following reaction:

6 CO2 + 6 H2O ? (CH2O)4H (glucose) + 6 02

Will this reaction require energy?
Will ?G be positive or negative?
Are the carbons in the glucose molecule oxidized or reduced?

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Answer #1

Photosynthesis is not a spontaneous process since it requires the input of energy. The given reaction is that of photosynthesis but stated without the input of photon. So per se, the given reaction will not occur on its own. It will require input of external energy.

G is negative for all spontaneous reactions and positive for all non-spontaneous reactions. Thus for the given reaction G is positive.

Loss of electrons is oxidation and gain is reduction. In the given reaction, carbon gains electrons. thus we say that it is reduced.

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