Final answer:
A storage cylinder of recovered R-22 at room temperature will be pressurized to around 175 psig. Therefore, the correct option is C.
Step-by-step explanation:
A storage cylinder of recovered R-22 at normal room temperature (about 75 F) in the absence of non-condensables will be pressurized to around 175 psig (pounds per square inch gauge).
When a gas is confined in a closed container like a cylinder, its pressure increases as the temperature increases. This relationship is described by the ideal gas law, which states that the pressure of a gas is directly proportional to its temperature (when volume and amount of gas are held constant). Therefore, if the temperature of the cylinder is increased, the pressure of the R-22 gas inside will also increase.