AP Chemistry
posted by Alex .
Summary of problem
Photosynthesis uses CO2 & H20 to make C6H12O2. If a plant has 99 grams of CO2 & 68 grams of H2O for photosynthesis, what's the balanced equation, the mass of glucose made, & the mass of excess?

1) balance the equation by making sure you have the same number of carbon, oxygen, and hydrogen atoms on both the reactants and products side.
2) find the limiting reagent the reactant (CO2 or H2O) that produce the least amount of glucose
3) find the difference in the grams of glucose produced from the reactants 
http://www.iun.edu/~cpanhd/C101webnotes/quantchem/limitingreagent.html

I can't get EXACTLY 68 grams of water; dunno how to change equation without using a fraction.

Add O2 on the product side and now balance the equation.
CO2 + H20 > C6H12O2 + O2