The R&D division of your company has released the following limited data on proprietary compound X_-23:

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T (C) 25 25 P (bar) 0.01 20 p (kg/m) 0.0177 39.8 Saturation pressure at 25 C: 64.3 bar Critical temperature: below 35 C Using this incomplete information estimate as best as you can the following: a) Phase of X-23 at 12 bar, 25 C. b) The molar mass of X-23. c) The second virial coefficient at 25 C. d) The required volume of a tank that is needed to store 20 kg of X-23 at 12 bar, 25 C. e) State clearly and justify as best as you can all your assumptions and the methods you use.