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A storage cylinder of recovered R-12 at normal room temperature (about 75°F) in the absence of non-combustibles will be pressurized to:

a) 0 psig
b) 30 psig
c) 50 psig
d) 100 psig

Answer :

Final answer:

At a normal room temperature of about 75°F, recovered R-12 in a storage cylinder is pressurized to approximately 70 to 75 psig, with the closest answer choice provided being 100 psig. The correct answer is d).

Explanation:

The question concerns the pressure of a storage cylinder containing recovered R-12 refrigerant at normal room temperature, which is approximately 75°F. R-12 is a chlorofluorocarbon, a gas commonly used in air conditioning and refrigeration systems. At 75°F, R-12 has a specific pressure it will exert when confined in a closed space.

The pressure exerted by a gas depends on its temperature, volume, and quantity according to the ideal gas law, but refrigerants like R-12 also have specific properties and will have known pressures at given temperatures when they are not reacting with other substances (assuming no non-combustibles are present).

According to pressure-temperature (PT) charts for R-12, at 75°F, the gas would exert a pressure of approximately 70 to 75 psig. However, since this specific answer choice is not provided among the options, the closest correct answer would be (d) 100 psig.

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