Atmospheric air at \(98.5 \mathrm{kPa}\) and \(20^{\circ} \mathrm{C}\) is drawn into a vacuum tank through a convergent-divergent nozzle of \(50-\mathrm{mm}\) throat diameter and \(75-\mathrm{mm}\) exit diameter. Caiculate the largest mass flow rate that can be drawn through this nozzle under these conditions.