Final answer:
The temperature at which flue gases condensate is generally around or just above the boiling point of water, commonly near 130°F assuming standard pressure conditions. The exact temperature will depend on the specific gas composition and pressure.
Step-by-step explanation:
The temperature at which flue gases condensate can vary depending on the composition of the gases and the pressure conditions. However, flue gases commonly condensate when they are cooled below the dew point temperature, which is typically around the boiling point of water or slightly higher. Based on the provided answer choices, although none are exact for water vapor condensation, the closest standard temperatures that flue gases might begin to condensate at are 130F (A), 127F (B), 129F (C), and 125F (D). Given the context of flue gas condensation and that the listed temperatures are smidge higher than the boiling point of water at 1 atmosphere of pressure (which is 100°C or 212°F), answer choice A (130°F) could be considered a potential answer assuming standard pressure. However, in practice, this will depend on the actual flue gas composition and pressure.