If an ammonia receiver can hold 1000 pounds of liquid at 90°F, what is the mass capacity for this receiver?

To determine the mass capacity of an ammonia receiver, it is essential to understand that the mass capacity is defined by the physical amount of ammonia the receiver can hold in liquid form. In this case, the problem specifies that the receiver can hold 1000 pounds of liquid ammonia at 90°F.

The receiver's ability to hold 1000 pounds at this temperature directly indicates its total capacity, as this is the maximum amount of liquid ammonia it can contain without exceeding its design specifications or limits. Therefore, the mass capacity is correctly identified as 1000 pounds, which represents the full capacity of the receiver.

The other options do not accurately reflect the maximum capacity specified in the question. Since the question indicates that the receiver can hold 1000 pounds of liquid, any lower weight such as 800 or 900 pounds would not represent the full mass capacity, revealing that these options are not appropriate responses to the question posed.