I’d like to ask how to solve a Juhua problem
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17. Given that the second virial coefficient of CO2 at 0 °C is B = –0.151 m3/kmol, what is the pressure required to compress CO2 to a density of 80 kg/m3 at 0 °C? A. 1.0×106 Pa B. 2.0×106 Pa C. 3.0×106 Pa D. 4.0×106 Pa. How is the answer calculated?
The unit for registering V is m3/mol
I’d like to ask: where did you find this question?
For 1 kmol of CO2 at a density of 80 kg/m3, the volume is 44/80 = 0.55 m3. P = (1–0.151×1/0.55) × 273 × 8.314 × 1000/0.55 = 2.99 × 10^6 Pa; what about C?
Z=1+B/V. V=44/80=0.55 M3/kmol; the value of B is known, so Z=0.718. P=ZnRT/V=ZρRT/M=0.718*80000*8.314*273/44=3000000 Pa. The correct answer is C; P