1. The problem statement, all variables and given/known data You have several identical balloons. You experimentally determine that a balloon will break if its volume exceeds 0.900L . The pressure of the gas inside the balloon equals air pressure (1.00 atm). The air inside the balloon has a constant temperature of 22 C. How many grams of oxygen can be blown into the balloon before it explodes? Helium? 2. Relevant equations .9L = .0009m^3 22C = 295.15 1 atm = 1.013 x 10^5 PV = nRT 3. The attempt at a solution (1.013 x 10^5)(.0009) = n(8.31)(295.15) n = .03717 moles .03717 moles = .593 grams of oxygen I don't know if I've forgotten something with chemistry or I've missed something in the calculation, but that answer's being spit out as incorrect (automated grading). Obviously I can't do the helium part until I figure out what's wrong with this part. Thanks.