6. [5 Pts] Difference in evaporation point is often used to separate substances (i.e. oil refinery)....

 

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6. [5 Pts] Difference in evaporation point is often used to separate substances (i.e. oil refinery). In this question, you examine a simplified version of such processes. A beaker contains 0.1 kg of ammonia and 0.1 kg of R-134a at -50 C. The system is in an atmospheric condition, and heat is applied to the system until the two substances separate in different phases. You can treat this as an isobaric process taking place at the atmospheric pressure (~100 kPa). For simplicity, assume that heating from atmospheric temperature (~23 C) is negligible compared to the heat you are supplying to the system and ignore the mass of the beaker. Air does not contain ammonia or R-134a. Atmospheric pressure 100 kPa 0.1 kg Ammonia + 0.1 kg R-134a -50 (a) What are the specific internal energies (u) at the beginning? Assume u of liquid only depends on temperature. [1 Pt] (c) What is the work done by the newly formed vapor? [1 Pt] (d) What is the heat required to complete the phase separation? [2 Pts] (e) How would you re-capture the evaporated substance? [1 Pt] 6. [5 Pts] Difference in evaporation point is often used to separate substances (i.e. oil refinery). In this question, you examine a simplified version of such processes. A beaker contains 0.1 kg of ammonia and 0.1 kg of R-134a at -50 C. The system is in an atmospheric condition, and heat is applied to the system until the two substances separate in different phases. You can treat this as an isobaric process taking place at the atmospheric pressure (~100 kPa). For simplicity, assume that heating from atmospheric temperature (~23 C) is negligible compared to the heat you are supplying to the system and ignore the mass of the beaker. Air does not contain ammonia or R-134a. Atmospheric pressure 100 kPa 0.1 kg Ammonia + 0.1 kg R-134a -50 (a) What are the specific internal energies (u) at the beginning? Assume u of liquid only depends on temperature. [1 Pt] (c) What is the work done by the newly formed vapor? [1 Pt] (d) What is the heat required to complete the phase separation? [2 Pts] (e) How would you re-capture the evaporated substance? [1 Pt]