- A Pyrex Glass Cylindrical Container Is Used To Store A Helium Gas At 2 Bar And 20 C The Container Has A Length And Thi 1 (64.93 KiB) Viewed 27 times
A pyrex glass cylindrical container is used to store a helium gas at 2 bar and 20 °C. The container has a length and thickness of 200 cm and 0.5 cm respectively. The inner diameter of container is 19.5 cm and the molar concentration of helium at the inner surface is 7.5 x 10-7 mol/cm³. Given the surrounding of the container is atmospheric air at 1 atm and 20 °C. a) State THREE (3) assumptions for the stated condition. b) Determine the solubility of the helium gas at the stated condition. [3 marks] [CO3, PO3, C1] [5 Marks] [CO3, PO3, C3] c) Calculate the flow rate of helium diffused through this container if the diffusion coefficient of helium in the pyrex at the temperature of 20 °C is 4.5×10-¹5 m²/s. [12 Marks] [CO3, PO3, C3] d) Calculate the mass of the helium diffused after one day. The molecular weight of the helium is 4 kg/kmol. [5 Marks] [CO3, PO3, C3]