Use a vacuum inerting procedure with nitrogen to reduce the oxygen concentration to \(1 \mathrm{ppm}\). The vessel has a volume of \(3.78 \mathrm{~m}^{3}\) and initially contains air, the vacuum system can deliver \(20 \mathrm{~mm} \mathrm{Hg}\) absolute, the temperature is \(24^{\circ} \mathrm{C}\), and the highest pressure is \(1 \mathrm{~atm}\). Determine the number of purges and the total amount of nitrogen used (in \(\mathrm{kg}\) ). Repeat for a vessel with a volume of \(37 \mathrm{~m}^{3}\) and a vacuum of \(30 \mathrm{~mm} \mathrm{Hg}\).