I-72. The density of air at sea level and 98F is about 1.20gL1. The volume of the adult human lungs in the expanded state is about 6.0 liters. Given that air is 20% oxygen by mass, compute the number of grams of oxygen in your lungs. number of kilograms and pounds of sulfuric acid in a 2.20-liter bottle of laboratory sulfuric acid. I-64. Calculate the volume of 55 grams of benzene, given that the density of benzene is 0.879gcm3