Please help with another Gas Stoichiometry question:

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by Pinkpantherkat at April 21, 2011

Oxygen masks for producing O2 in emergency situations contain potassium superoxide, KO2. If 5.15liters of O2 at 35*C and 99.5 kPa were wanted, how many grams of KO2 would be needed?

The equation is 4KO2 (s) + 2H2O (l) + 4CO2 (g) --> 4KHCO3 (s) + 3O2 (g)