Final answer:
The refrigerant in a lithium bromide refrigeration system is water (B), which is used in conjunction with a lithium bromide solution. Freon-12 is a gas at room temperature due to its boiling point being -29.8°C.
Step-by-step explanation:
The refrigerant in a lithium bromide refrigeration system is B) water. Unlike most other refrigeration systems that use refrigerants such as Freon or ammonia, a lithium bromide absorption refrigeration system uses water as the refrigerant and lithium bromide solution as the absorbent. This type of system is mainly used for air conditioning purposes and harnesses heat rather than mechanical energy to provide a cooling effect.
Regarding Exercise 1.2.1, Freon-12, with a boiling point of -29.8 °C, would be a gas at room temperature, which is typically around 25°C. This is because Freon-12's boiling point is below room temperature, indicating that it has transitioned from a liquid to a gas phase.
For Exercise 6.6.1, HFCC-142b represents an alternative to Freon as an example of a hydrochlorofluorocarbon (HCFC) that has been used to replace chlorofluorocarbons due to environmental concerns related to ozone depletion.