What is the vapor density of the substance at -28°F and 1 atm?

To determine the vapor density of a substance at a specific temperature and pressure, one must consider the characteristics of the gas given the conditions provided. At -28°F and 1 atm, the vapor density is calculated based on the ideal gas law or can be referenced from tables specific to refrigerants or gases at those conditions.

The calculation or lookup generally yields vapor density, which represents how much mass is contained in a certain volume, often expressed in lb/ft³. In this scenario, the value of 0.0549 lb/ft³ is the result derived from standard reference materials or calculations specific to the gases in question, confirming that this particular value is appropriate for the conditions specified.

Understanding vapor density is crucial for calculating the proper refrigerant charge and assessing hazards related to gas leaks in industrial refrigeration systems. This figure plays a vital role in designing systems, ensuring safe operations, and complying with environmental regulations. The other options do not match the value extracted or calculated for these conditions, which reinforces why the chosen answer is accurate for the given circumstances.