56. You have determined that a cargo space on a freight vessel is 45 feet by 36 feet by 62 feet. How many pounds of carbon dioxide is required for this space?

The required carbon dioxide is calculated by determining the volume of the cargo space (length x breadth x height) and dividing by 30 cubic feet per pound of CO2. The volume is 45 ft x 36 ft x 62 ft = 100,440 ft3, resulting in a CO2 requirement of 100,440 ft3 / 30 ft3/lb = 3348 lb, which corresponds to answer choice C.