If a chlorine cylinder is full at 150 pounds and marked with RW 125, how much chlorine does it contain?

In the context of chlorine cylinders, the term "RW" stands for "recommended weight." When a chlorine cylinder is marked with RW 125, this indicates the minimum weight of chlorine that should be in the cylinder when it is full. The full cylinder has a maximum capacity of 150 pounds. Therefore, the cylinder contains 150 pounds of chlorine. This understanding of labeling and weight is crucial for safe handling and for ensuring that the chlorine levels are appropriate for use. The correct answer reflects the total maximum weight of the full cylinder, which is 150 pounds, rather than what may be indicated by the RW marking.