Hellow...i'm gerry from Indonesia, maybe I could help you a little to help your case. the first thing you have to do is convert volume carbon dioxide into mole unit. how? STP means the condition of this reaction is ----> 22.4 liter per mole. thus, now you'll have the mole of CO2. after that, see the completed reaction, mole ratio of glucose is a half of the carbon dioxide one. That means, now you know your glucose's mole. How weight is it? use this general equation: m = n x Mr....well then.....you'll get everything clear..