Question

2. The data below have been obtained for the liquid-vapor equilibrium compositions of mixtures of nitrogen (N2) and oxygen (O2) at 100 kPa. When a liquid contains 21% O2 and 79% N2, answer the following question (a) Which one is more volatile? N2 or O2? (b) When the liquid with 21% O2 was heated at 100 kPa, at what temperature the first bubble formed? What is the concentration of O2 in the first bubble? (c) As the last drop of liquid is evaporating, what is the fraction of O2 in the liquid phase? At what temperature? (d) Determine the temperature that forms 40% of liquid and 60% vapor. What are the compositions of O2 in the liquid and the vapor in equilibrium? Verify your answer by calculation using the equilibrium compositions (e) Is the above N2 and O2 mixture an ideal solution? Data The liquid-vapor equilibrium compositions of mixtures of nitrogen (N2) and oxygen (O2) at 100 kPa T/K 77.3 80 86 78 82 84 88 90.2 x(02) 0 0.1 0.340.54 0.7 0.82 0.92 y(O2) 0 0.02 0.11 0.22 0.35 0.52 0.73 p(O2)/bar 0.2053 0.2279 0.2999 0.3919 0.5025 0.63850.8011 1.0130

Answer 1

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