An underwater photojournalist filled his 0.1m3 SCUBA tank with air, g 29\ mol Mw = 29 g/mol and went to the deep sea to photograph underwater species for the National Geographic Channel. As soon as he came out of the deep sea, the pressure and temperature of the SCUBA tank were 0.7MPa\ and 280K, respectively. If we assume that air is modeled by the virial equation of state truncated at the second virial coefficient, how many kg of air is left?\