(Solved):   Question 1 [12 marks] A spherical vessel of 1.5 m diameter containing air at 315 K is evac ...

 

Question 1 [12 marks] A spherical vessel of 1.5 m diameter containing air at 315 K is evacuated until the vacuum pressure inside the vessel is 730 mm of mercury; the evacuation process is carried out at constant temperature. Determine the mass of air pumped out of the vessel. Also, calculate the pressure in bar inside the vessel if the remaining air is cooled to 275 K. Ra=287 J/kg. K and the atmospheric pressure as 760 mm of mercury and density of mercury For air take 13.59 x 103 kg/m³. 14OA