Consider again the reaction for photosynthesis: 6CO2 + 6H2O → C6H12O6 + 6O2 What mass of water is required to react completely with 157.35 g CO2? (Molar mass of H2O = 18.02 g/mol; molar mass of CO2 = 44.01 g/mol) 157.35 g CO2 = g H2O

The balanced reaction equation for photosynthesis is as follows;

6CO₂ + 6H₂O - - > C₆H₁₂O₆ + 6O₂

stoichiometry of CO₂ to H₂O is 6:6. Equal number of moles of CO₂ and H₂O react.

Mass of CO₂ reacted = 157.35 g

the number of moles of CO₂ that reacted = 157.35 g / 44.01 g/mol = 3.58 mol

Therefore the number of H₂O moles that have reacted - 3.58 mol

then the mass of H₂O required - 3.58 mol x 18.02 g/mol = 64.43 g

64.43

answer in short