1. The density of air is 1.3g/L at standard conditions of 101kPa and 0 degrees celcius. determine the mass of 3.0 L of air at a pressure of 138.2 kPa and a temp of 273 degrees celcius. 2. One atmosphere of air pressure supports a column of water approximately 10.3 m high. A 2.0-cm^3 bubble of air is released by a diver working 62.4 m below the surface of a deep lake. If its temp remains constant, what is the volume of the bubble as it reaches the surface? the pressure on the surface of the lake is one atm. 2. Relevant equations i need help with bother of these. alli know is that you use the gas laws. 3. The attempt at a solution for the first one...i worked at it with a friend at we(mostly him) got i think 21 grams? i left my answer sheet in school but it was around there. He never really got to explain it to me so im confused. And for the second im sorry but i have no idea even how to start that one.