Final answer:
The question pertains to the amount of refrigerant vapor left in a fictional 350-ton R-123 chiller at 0 psi after all liquid has been removed. An exact answer cannot be given without additional data, but likely options indicate a small volume remaining in comparison with the total charge of the chiller. So, the all options are not correct.
Step-by-step explanation:
The question asks about the approximate amount of refrigerant vapor left in a 350-ton R-123 chiller at 0 psi after all the R-123 liquid has been removed.
This type of question falls into the field of thermodynamics, a branch of engineering that deals with the principles governing energy and energy transformations such as phase changes and refrigeration cycles.
Without specific information given regarding the volume of vapor space in the chiller or the specific properties of R-123 at these conditions, it is difficult to provide an exact answer.
However, the amounts listed (1 lb, 10 lbs, 15 lbs, 20 lbs) represent typical refrigerant charge remnants in large chillers, indicating that the volume of vapor after the liquid has been removed would be relatively small compared to the total refrigerant charge that a 350-ton chiller would hold.
It's important to note that since the question doesn't specify the needed data, any provided answer would likely be an estimate based on industry norms rather than a precise calculation derived from thermodynamic principles.
Therefore, the all options are not correct.