Final answer:
The final pressure in a refrigerant recovery cylinder after cooling and potential gas leakage can be calculated using the combined gas law and the ideal gas law. Practicality for repair should be assessed depending on the ease of achieving and maintaining the required temperatures.
Step-by-step explanation:
The question involves the use of the ideal gas law and the concept of gas pressure and temperature relationships when dealing with refrigerant recovery cylinders. Applying the ideal gas law can provide the answers to the scenarios given, which pertain to changing conditions in a gas cylinder. Here's how you can solve each part:
- (a) Final pressure with no gas leak: Use the combined gas law, which is P1/T1 = P2/T2, where P refers to pressure and T to temperature (in Kelvins). Keeping the volume and the amount of gas constant, and assuming no phase change, you can find the new pressure after cooling.
- (b) Final pressure with gas escape: First, calculate the new amount of gas after the escape, then use the ideal gas law to find the new pressure.
- (c) Temperature to reduce pressure to 1.00 atm: Use the ideal gas law equation, solving for the temperature that will result in the desired final pressure of 1.00 atm.
- (d) Practicability of cooling the tank: This depends on the results obtained from the previous calculations and practical considerations like the feasibility of reaching such temperatures and maintaining them.
Approved refrigerant recovery cylinders can contain various gases used in refrigeration, such as carbon tetrachloride, methyl chloroform, hydrochlorofluorocarbon-22 (HCFC-22), hydrochlorofluorocarbon-123 (HCFC-123), and hydrochlorofluorocarbon-124 (HCFC-124).