If an ammonia receiver has a capacity of 1000 pounds at 90°F when completely filled, what is its mass capacity?

The mass capacity of an ammonia receiver is determined by the weight of the ammonia that can be stored within it at a specified temperature and pressure. In this context, the question specifies that the receiver can hold 1000 pounds of ammonia when it is completely filled at 90°F. However, the mass capacity refers to the actual quantity of ammonia that the receiver can safely and effectively accommodate, which can sometimes be less than the total physical capacity due to various factors such as temperature and pressure conditions or safety constraints.

In this case, if the answer indicates a mass capacity of 800 pounds, this likely reflects the effective limit for the ammonia in practical scenarios, accounting for safety margins or operational efficiencies. Therefore, it highlights the importance of not just relying on the total volume or weight that the receiver could theoretically hold, but understanding the operational realities and limitations when dealing with ammonia refrigeration systems.

This interpretation suggests that while the receiver has the structural ability to contain up to 1000 pounds, the effective mass that can be safely utilized within operational limits is reduced to 800 pounds under the given conditions.