# 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.

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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