Q. 484.0( 4 Votes )

In photosynthesis, 6 molecules of carbon dioxide combine with an equal number of water molecules through a complex series of reactions to give a molecule of glucose having a molecular formula C6 H12 O6. How many grams of water would be required to produce 18 g of glucose? Compute the volume of water so consumed assuming the density of water to be 1 g cm–3.

Answer :

During photosynthesis, following reaction takes place:

6 CO2 + 6H2O C6H12O6 + 6O2


1 mole glucose needs 6 moles of water.


Molar mass of glucose (C6 H12 O6) = 180g


molar mass of water = 18g


We know, Number of moles =


180 g of glucose needs = (6 x 18)g of water


1g glucose will need =


18g glucose would need =


Volume =


The density of water = 1 gcm-3


Therefore, volume of water consumed = =


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