You can start with the ideal gas law PV=nRT and just assume standard pressure and temperature (obviously as the bag inflates that would no longer be true but for the purpose of the question just ignore that). You have the volume of the container you want to fill (55.0 gallons) and want to find the number of moles of N2 youu2019ll need to fill that container.So, n= PV/RT. Remember that the value that you use for the constant R is dependent on the units that you choose for P,V and T so make sure they all agree.Once you have the number of moles of nitrgas that you would need, you have the stoichiometric ratio of N2 compared to NaN3 (ie 3 to 2) and can figure out the number of moles of NaN3 that you would need in order to produce enough N2 to fill the bag. Then you just use the molar mass of NaN3 and the number of moles of NaN3 you need to find the mass (m=n/M).Iu2019m not sure what u201cconversion factoru201d youu2019re talking about. If you mean changing from gallons to liters just look up a conversion online.