A vertical cylinder with a heavy piston contains air at a temperature of 300 K. The initial pressure is 250 kPa and the initial volume is 0.350 m^3. Take the molar mass of air as 28.9 g/mol and assume that CV = 5R / 2. (b) Calculate the mass of the air in the cylinder. I know I have to use the volume that they provided me and the molar mass of air to somehow calculate the mass of the air in cylinder. Could someone please give me a hint in the right direction?