Question

can you explain why 12 molecules of water are used as substrate in the equation of photosynthesis

Answer 1

for balancing..........

Answer 2

Hi..
Heres ur answer..

The net reaction of photosynthesis is-

6CO2 + 12H2O → C6H12O6 + 6H2O + 6O2
From this reaction, it is clear that to form one molecule of glucose, six molecules of carbon dioxide are required.

Products of light reaction required in dark reactions to form one molecule of glucose are 12 molecules of NADPH and 18 molecules of ATP.

-- For forming 2 molecules of NADPH from NADP+ , 2 molecules of water are required so that demand of  4 electrons and protons   can be satisfied. 

--Two molecules of water split to form1 molecule of oxygen and the respective number of electrons and hydrogen ions are also formed .

--Now for producing 12 molecules of NADPH , total 12 molecules of water are required.

i hope u got it !!☺