4. = Helium, in a large tank at 100°C and 400 kPa, discharges to a receiver through a 2.5 with exit area 1.2 cm². converging-diverging nozzle designed to exit at Ma Compute (a) the receiver pressure and (b) the mass flow at design conditions. (c) Also estimate the range of receiver pressures for which mass flow will be a maximum. Hint: This problem is for Helium for which k does not equal 1.4. Therefore, tables B1 and B2 cannot be used. Use Table A6 to find R and k for helium. 2.15